feat(cpu): add library support for Hunter ELP

Add basic CPU library code to support the Hunter ELP CPU in TF-A.
Hunter-ELP adds v9.2 architecture support and is derived from
Makalu-ELP. As such, the library code is adapted from the
Makalu-ELP support library.

Change-Id: I7e93b9af6b1f0bc4d08c3cf5caf071d2cbdbc89f
Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
diff --git a/plat/arm/board/tc/platform.mk b/plat/arm/board/tc/platform.mk
index 1a1bc56..7485842 100644
--- a/plat/arm/board/tc/platform.mk
+++ b/plat/arm/board/tc/platform.mk
@@ -80,7 +80,8 @@
 # CPU libraries for TARGET_PLATFORM=2
 ifeq (${TARGET_PLATFORM}, 2)
 TC_CPU_SOURCES	+=	lib/cpus/aarch64/cortex_hayes.S \
-			lib/cpus/aarch64/cortex_hunter.S
+			lib/cpus/aarch64/cortex_hunter.S \
+			lib/cpus/aarch64/cortex_hunter_elp_arm.S
 endif
 
 INTERCONNECT_SOURCES	:=	${TC_BASE}/tc_interconnect.c