Add missing parentheses to macros in arch.h
Add missing parentheses to macros in arch.h

Change-Id: Ifea46da46d1bfd01b341acfad75df5bcab48a204
Signed-off-by: Antonio Nino Diaz <5c24ff39be768bf31f4deee44042a11772cfd02a@arm.com>

achingupta/arm-trusted-firmware,achingupta/arm-trusted-firmware