supress-gcc-warnings: util-libs

-Use const in correct places
-Use casts
-Return correct interface type

Signed-off-by: Oliver Scott <Oliver.Scott@data61.csiro.au>

trivial: Style changed files

tk1: Fix improper bit OR'ing in MUX driver

The tristate bit in the registers were not being set properly.

platsupport: Don't require plat/mux.h on all plats

As mux_sys_init is currently required on all Arm platforms, having a
enum definition for all mux features that a platform has requires
defining the enum on all platforms.
We instead replace enum mux_feature with a typedef'd ssize_t and allow
platforms to define enum mux_feature definitions at an implementation
level rather than interface level.

util_libs: remove autoconf.h from util_libs

this commit removes autoconf.h generation from each lib and
append '#include <<lib_name>/gen_config.h>' after each
'#include <autoconf.h>' since autoconf.h is only the for the
kernel config now. This is a temporarily solution, since we
currently don't have a way to tell which header files each file
is trying to include when it includes 'autoconf.h'

platsupport: Tk1 mux: Soften the drive strength on signals

This change is meant to ensure that the drive strength isn't so strong that
signals being toggled causes the voltage to drop

platsupport: TK1 mux: PA3 PPM input is an input; not bidirectional

platsupport: TK1: Fix build error by properly guarding debugging name

platsupport: mux: Fix build errors for platforms that haven't been directly targeted

platsupport: TK1 Mux: I2C3 doesn't support the open-drain bit

platsupport: TK1 Mux: Add mux config for using UARTB pins as GPIOs

* This new mux feature will steal 2 of UART-B's pinouts (RTS and CTS)
and use them as GPIOs for debugging.

platsupport: TK1 Mux: Add PA3 to mux driver

platsupport: TK1: Add a MUX driver and define mux pinout configs

This driver properly support pin output drivers and drive strengths as
well as the different output drivers supported by each pin - push-pull,
open-drain, tristate, pullup and pulldown.

Furthermore, it also adds the code to determine the strength of the slew rate
at which these signals are driven out. This feature was originally added to
investigate whether or not the I2C0 lines could be forced up to 3.3v from 1.8v.

platsupport: TK1 Mux: Use the dependencies argument in mux_sys_init

platsupport: Mux API: Add a dependencies parameter to mux_sys_init

This is a workaround for the fact that we have no real dependency tree at the
moment. The two approaches to this problem were either:
* Add a gpio_sys_t member inside of ps_io_ops_t, similar to the way we already have
a clock_sys_t and a mux_sys_t in there.
* Add a void *dependencies argument to the mux_init function that will enable us to
pass arbitrary extra dependencies in.

The latter was chosen because while it is more intrusive, it is slightly more
flexible.

Fix whitespace

- remove trailing whitespace
- remove duplicate blank lines
- remove blank lines at end of file

fix licenses

libplatsupport: Refactor tk1 gpio/mux code

This commit refactors the mux and gpio code of the tk1 in the following ways
* Put GPIO code in gpio.c, not mux.c
* Bring back platform generic mux_sys_init and gpio_sys_init functions
* Make GPIO depend upon a mux without the mux initializing the GPIO
* Remove globals and use the provided 'priv' parts of the 'sys' structs
* Require gpio_sys_t be passed to 'gpio_*' functions instead of using
global variables
* Remove circular dependencies in headers and '#ifndef CONFIG_PLAT_TK1's from
generic arm headers

Integrating changes from DARPA repo to trunk

libplatsupport/tk1: add dummy functions