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

platsupport: Change pending_status 'clear' type

A bool for suggesting to clear the interrupt flag represents the type
better than an int.

platsupport: Replace read/write w/ set/read_level

This is the second part of the change to remove the ability the chain
together pins in the driver level. Now that it's not possible to chain
together pins, we replace the read/write functions with pin unit level
functions.

platsupport: Remove GPIO set_next and next field

The functionality to be able to chain together GPIO pins is outside the
scope of the driver, this functionality should instead belong to a
utility library. This commit removes this from the drivers so that it
can be refactored into a library.

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

The Arm interface for gpio_sys_t doesn't require any platform
definitions and so we don't need to include a platform header file.

platsupport: use ZF_LOG* instead of custom macros

This commit removes redundant definitions of debug print macros
and replaces them with use of ZF_LOG*.

platsupport: TK1 GPIO: read and write should return number of bits read/written

platsupport: TK1 GPIO: read: Clear the bit before ORing

This ensures that if the value read from the GPIO controller is a 0,
but the buffer passed in was not memzero'd before read() was invoked,
that the read() function would actually assign a 0 to the bit index
anyway.

platsupport: TK1: GPIO: Cleanup and refactor driver

This patch does a cleanup to make the TK1 GPIO driver conformant to the platsupport
GPIO driver API. Among other things:

* Define TK1_GPIO_PADDR and TK1_GPIO_SIZE
* Remove the custom API constants (gpio_mode, etc) and use enum gpio_dir.
* Don't expose internal functions. Mark them as static.
* Use MAP_IF_NULL()
* Define a struct for accessing the GPIO controller's registers instead of
doing pointer arithmetic everywhere.
* Document the unusual dependencies between the mux driver and gpio driver.
* Support chain writing to linked pins.

Fix whitespace

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

fix licenses

TK1: GPIO: Add pins for the SPI sensor chip select GPIOs

The SPI CSn signals for the daughterboard's sensors are connected to various GPIO
pins. We add those pins to the current GPIO driver here.

libplatsupport: Provide usb_vbus_en1 for TK1 GPIO

libplatsupport: SELFOUR-724 Avoid return after error

Functions in tk1/gpio.c validate their inputs and print out an error if
they are incorrect. Previously they would then continue and perform some
action. Due to an ability for this functions to return an error to the
caller this changes these cases to panic

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

Integrating tegra gpio interrupt code from DARPA framework

Remove trailing whitespace

libplatsupport: minimal GPIO functionality for Tegra