Gaurav-Aggarwal-AWS 3b18a07568
Add .syntax unified to GCC assembly functions ()
This fixes the compilation issue with XC32 compiler.

It was reported here - https://forums.freertos.org/t/xc32-v4-00-error-with-building-freertos-portasm-c/14357/4

Signed-off-by: Gaurav Aggarwal <aggarg@amazon.com>

Co-authored-by: Paul Bartell <pbartell@amazon.com>
..
port.c
portasm.c Add .syntax unified to GCC assembly functions ()
portasm.h
portmacro.h
portmacrocommon.h