refactor(makefile): remove BL prefixes in build macros

The current Makefile assumes all TF-A binaries
have BL prefixes (BL1, BL2, etc). Now that we
have other binary names with FEAT_RME feature, remove
this assumption. With this change, we need to pass
the full name of a binary when using build macros.

Signed-off-by: Zelalem Aweke <zelalem.aweke@arm.com>
Change-Id: I44e094b2366aa526f807d92dffa709390d14d145
3 files changed