refactor(fvp): minor cleanup with TRUSTED_BOARD_BOOT

CRYPTO_SUPPORT is enabled by default when TRUSTED_BOARD_BOOT is
enabled so usage CRYPTO_SUPPORT in conjunction with TRUSTED_BOARD_BOOT
might sometime be confusing to look at.

Adding minor cleanup to make it look simpler with conditions.
No functionality changes.

Change-Id: I800524d54ea56dc27b6c6da26c75a07f5f6de984
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>
1 file changed