fix(morello): use TARGET_PLATFORM instead of PLAT_FVP

In Morello platform, TARGET_PLATFORM build flag is used
to differentiate between the Morello FVP and Morello SoC
platform.

Signed-off-by: Chandni Cherukuri <chandni.cherukuri@arm.com>
Change-Id: I0e1fbf1a783aa9f9285ca21d46fee32c22b06fc5
2 files changed