ArmPkg/CpuDxe: Implement EFI memory attributes protocol

Expose the protocol introduced in v2.10 that permits the caller to
manage mapping permissions in the page tables.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Leif Lindholm <quic_llindhol@quicinc.com>

ArmPkg/Drivers/CpuDxe/CpuDxe.inf

@@ -23,6 +23,7 @@
   CpuDxe.h
   CpuMmuCommon.c
   Exception.c
+  MemoryAttribute.c
 
 [Sources.ARM]
   Arm/Mmu.c
@@ -53,6 +54,7 @@
 
 [Protocols]
   gEfiCpuArchProtocolGuid
+  gEfiMemoryAttributeProtocolGuid
 
 [Guids]
   gEfiDebugImageInfoTableGuid