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: Move default serial definitions

These are moved from libsel4platsupport. They are used in addition to
PS_SERIAL_DEFAULT which is defined in this library, and they also use
interrupt and physical address definitions defined in this library.
Moving them here reduces a bit of indirection when choosing a default
serial device.

pragma once and for all

plat/imx7: correct default UART port

plat/imx7: add initial support for imx7 SoC

Fix whitespace

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

fix licenses

libplatsupport: add missing header file

Remove trailing whitespace

Added changes for Wandboard