ArmPkg: remove SetPrimaryStack and InitializePrimaryStack macros

ArmPkg: remove SetPrimaryStack and InitializePrimaryStack macros

The SetPrimaryStack and InitializePrimaryStack macros are no longer
used now that we removed support for ArmPlatformGlobalVariableLib.
So remove the various versions of them.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19004 6f19259b-4bc3-4df7-8a09-765794883524