fix(build): include Cortex-A78AE cpu file for FVP

So far, the FVP platform.mk file did not include the corresponding file
for Cortex-A78AE, causing the FVP to hang when executing the
plat_reset_handler function. The file is now included to address the
problem and to allow the new CI config for Cortex-A78AE to work
properly.

Change-Id: I8dd460831b354d8ca54841d5561df40ff193ee06
Signed-off-by: Juan Pablo Conde <juanpablo.conde@arm.com>
diff --git a/plat/arm/board/fvp/platform.mk b/plat/arm/board/fvp/platform.mk
index 0433b61..25c963b 100644
--- a/plat/arm/board/fvp/platform.mk
+++ b/plat/arm/board/fvp/platform.mk
@@ -197,6 +197,7 @@
 					lib/cpus/aarch64/cortex_a76ae.S		\
 					lib/cpus/aarch64/cortex_a77.S		\
 					lib/cpus/aarch64/cortex_a78.S		\
+					lib/cpus/aarch64/cortex_a78_ae.S	\
 					lib/cpus/aarch64/cortex_a78c.S		\
 					lib/cpus/aarch64/cortex_a710.S		\
 					lib/cpus/aarch64/neoverse_n_common.S	\