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.c

@@ -244,6 +244,8 @@ CpuDxeInitialize (
                   &mCpuHandle,
                   &gEfiCpuArchProtocolGuid,
                   &mCpu,
+                  &gEfiMemoryAttributeProtocolGuid,
+                  &mMemoryAttribute,
                   NULL
                   );