rcar_gen3: plat: Drop unused macro
rcar_gen3: plat: Drop unused macro

The macro is not used, drop it.

Signed-off-by: Marek Vasut <bcf2901fa1b128a7a3f88ee031c46807a29aa29d@gmail.com>

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