ArmPlatformPkg RVCT: drop dependency on GCC macro library

The RVCT .asm files include AsmMacroIoLib.h only for the definition of
LoadConstantToReg (), which makes it tedious to make change to that file
without the risk of making the RVCT assembler unhappy. So simply replace
LoadConstantToReg() with mov32, which does the right thing in all cases.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>

ArmPlatformPkg/Library/ArmPlatformLibNull/Arm/ArmPlatformHelper.asm

@@ -11,7 +11,6 @@
 //
 //
 
-#include <AsmMacroIoLib.h>
 #include <Library/ArmLib.h>
 
   INCLUDE AsmMacroIoLib.inc
@@ -47,8 +46,7 @@ ArmPlatformGetCorePosition FUNCTION
 //  VOID
 //  );
 ArmPlatformGetPrimaryCoreMpId FUNCTION
-  LoadConstantToReg (_gPcd_FixedAtBuild_PcdArmPrimaryCore, r0)
-  ldr   r0, [r0]
+  mov32 r0, FixedPcdGet32(PcdArmPrimaryCore)
   bx    lr
   ENDFUNC
 
@@ -57,11 +55,9 @@ ArmPlatformGetPrimaryCoreMpId FUNCTION
 //  IN UINTN MpId
 //  );
 ArmPlatformIsPrimaryCore FUNCTION
-  LoadConstantToReg (_gPcd_FixedAtBuild_PcdArmPrimaryCoreMask, r1)
-  ldr   r1, [r1]
+  mov32 r1, FixedPcdGet32(PcdArmPrimaryCoreMask)
   and   r0, r0, r1
-  LoadConstantToReg (_gPcd_FixedAtBuild_PcdArmPrimaryCore, r1)
-  ldr   r1, [r1]
+  mov32 r1, FixedPcdGet32(PcdArmPrimaryCore)
   cmp   r0, r1
   moveq r0, #1
   movne r0, #0

ArmPlatformPkg/Library/ArmPlatformStackLib/Arm/ArmPlatformStackLib.asm

@@ -11,8 +11,6 @@
 //
 //
 
-#include <AsmMacroIoLib.h>
-#include <Base.h>
 #include <AutoGen.h>
 
   INCLUDE AsmMacroIoLib.inc
@@ -79,8 +77,7 @@ ArmPlatformStackSetPrimary FUNCTION
   add   r0, r0, r2
 
   // Compute SecondaryCoresCount * SecondaryCoreStackSize
-  LoadConstantToReg (_gPcd_FixedAtBuild_PcdCoreCount, r1)
-  ldr   r1, [r1]
+  mov32 r1, FixedPcdGet32 (PcdCoreCount)
   sub   r1, #1
   mul   r3, r3, r1