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/fvp/platform.mk b/plat/arm/board/fvp/platform.mk
index 2539712..57a6639 100644
--- a/plat/arm/board/fvp/platform.mk
+++ b/plat/arm/board/fvp/platform.mk
@@ -143,6 +143,7 @@
 					lib/cpus/aarch64/cortex_a78c.S		\
 					lib/cpus/aarch64/cortex_hayes.S		\
 					lib/cpus/aarch64/cortex_hunter.S	\
+					lib/cpus/aarch64/cortex_hunter_elp_arm.S \
 					lib/cpus/aarch64/cortex_x2.S		\
 					lib/cpus/aarch64/neoverse_poseidon.S
 	endif