Makefile: Remove unused macro
Makefile: Remove unused macro

Removed unused macro AARCH32 and AARCH64 from makefile

Change-Id: I6729e300f18d66dd7c6978d3bbd5a88937839c31
Signed-off-by: Manish V Badarkhe <d2342ad575f6bc1a5f5a5b89d6db0f72dd7e0e4c@arm.com>

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