ArmPkg: update RVCT assembly functions to use new RVCT_ASM_EXPORT macro

This has the effect of splitting assembly functions into their own sections
so the linker can remove unused ones to save space.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Eugene Cohen <eugene@hp.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@gmail.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19109 6f19259b-4bc3-4df7-8a09-765794883524

ArmPkg/Library/BaseMemoryLibVstm/Arm/CopyMem.asm

@@ -37,11 +37,10 @@ InternalMemCopyMem (
   IN      UINTN                     Length
   )
 **/
-  EXPORT InternalMemCopyMem
 
-  AREA AsmMemStuff, CODE, READONLY
+    INCLUDE AsmMacroExport.inc
 
-InternalMemCopyMem
+ RVCT_ASM_EXPORT InternalMemCopyMem
   stmfd  sp!, {r4, r9, lr}
   tst  r0, #3
   mov  r4, r0