Add "_arm" suffix to Makalu ELP CPU lib

ELP processors can sometimes have different MIDR values or features so
we are adding the "_arm" suffix to differentiate the reference
implementation from other future versions.

Signed-off-by: John Powell <john.powell@arm.com>
Change-Id: Ieea444288587c7c18a397d279ee4b22b7ad79e20
diff --git a/plat/arm/board/fvp/platform.mk b/plat/arm/board/fvp/platform.mk
index 20d80ed..b58a0d2 100644
--- a/plat/arm/board/fvp/platform.mk
+++ b/plat/arm/board/fvp/platform.mk
@@ -134,7 +134,7 @@
 					lib/cpus/aarch64/cortex_klein.S		\
 					lib/cpus/aarch64/cortex_matterhorn.S	\
 					lib/cpus/aarch64/cortex_makalu.S	\
-					lib/cpus/aarch64/cortex_makalu_elp.S	\
+					lib/cpus/aarch64/cortex_makalu_elp_arm.S \
 					lib/cpus/aarch64/cortex_a65.S		\
 					lib/cpus/aarch64/cortex_a65ae.S		\
 					lib/cpus/aarch64/cortex_a78c.S