ArmPkg: Fix Ecc error 3002 in ArmMmuLib

This patch fixes the following Ecc reported error:
Non-Boolean comparisons should use a compare operator
(==, !=, >, < >=, <=)

Signed-off-by: Pierre Gondois <Pierre.Gondois@arm.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@arm.com>

ArmPkg/Library/ArmMmuLib/AArch64/ArmMmuLibCore.c

@@ -294,7 +294,7 @@ UpdateRegionMapping (
 {
   UINTN     T0SZ;
 
-  if (((RegionStart | RegionLength) & EFI_PAGE_MASK)) {
+  if (((RegionStart | RegionLength) & EFI_PAGE_MASK) != 0) {
     return EFI_INVALID_PARAMETER;
   }