Rename Cortex Hercules Files to Cortex A78

This should allow git to easily track file moves

Signed-off-by: Jimmy Brisson <jimmy.brisson@arm.com>
Change-Id: I1592cf39a4f94209c560dc6d1a8bc1bfb21d8327
diff --git a/plat/arm/board/arm_fpga/platform.mk b/plat/arm/board/arm_fpga/platform.mk
index 0d0d010..7039a6d 100644
--- a/plat/arm/board/arm_fpga/platform.mk
+++ b/plat/arm/board/arm_fpga/platform.mk
@@ -58,10 +58,10 @@
 	FPGA_CPU_LIBS	+=	lib/cpus/aarch64/cortex_a76.S		\
 				lib/cpus/aarch64/cortex_a76ae.S		\
 				lib/cpus/aarch64/cortex_a77.S		\
+				lib/cpus/aarch64/cortex_a78.S		\
 				lib/cpus/aarch64/neoverse_n1.S		\
 				lib/cpus/aarch64/neoverse_e1.S		\
 				lib/cpus/aarch64/neoverse_zeus.S	\
-				lib/cpus/aarch64/cortex_hercules.S	\
 				lib/cpus/aarch64/cortex_hercules_ae.S	\
 				lib/cpus/aarch64/cortex_a65.S		\
 				lib/cpus/aarch64/cortex_a65ae.S