Unify ThreadX and SMP for ARMv8-A.

[TiejunMS]

PR checklist

• Updated function header with a short description and version number
• Added test case for bug fix or new feature
• Validated on real hardware

[hodcarrier]

hello, ARMv8-A is hard to type... other projects refers it as armv8-a, gcc's compile option is -march=armv8-a, so why make a new name...
when pass the armv8-a from a environment variable, you have to do one more step:
translate armv8-a to ARMv8-A
eg.
if [ THREADX_ARCH == ARMv8-A ]
CFLAGS += -march=armv8-a
end of if

[TiejunMS]

hello, ARMv8-A is hard to type... other projects refers it as armv8-a, gcc's compile option is -march=armv8-a, so why make a new name... when pass the armv8-a from a environment variable, you have to do one more step: translate armv8-a to ARMv8-A eg. if [ THREADX_ARCH == ARMv8-A ] CFLAGS += -march=armv8-a end of if

Thanks for the suggestion! But ports_arch is a folder for internal development only. Users should use files from ports, ports_module and ports_smp.