[PATCH u-boot] Some cleanup of ast-g5 platform.S

[Maxim Sloyko]

Added ast_uart.{c,h} files, moved most of the diagnostic message printing
to ast-g5.c

Set up a stack in SRAM at the beginning of lowlevel_init, which makes it
possible to call non-trivial c functions, as well as put diagnostic strings
themselves onto the stack.

Several one-char writes to debug uart still remain in platform.S, I figured
it's not worth it to make a separate call to c function for each of those.

-- 
*M*axim *S*loyko
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