build(fpga): remove a710 from fpga build

Currently we have a large series of errata_refactor patches pending
and they are all failing on arm_fpga build when we add errata_framework.

Errata framework can cause the size to grow and thus causing build
failure on bl31 size. This as of today is blocking us from
merging most of our changes as it will introduce a CI failure.

As an workaround we try to just reduce the arm_fpga build by a710
platform, we have a715 and a720 which should be ok I think.

Once everyone are available for further discussion we could revert this
change back and discuss further whats the right approach.

Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>
Change-Id: I96a821e10aaecf04db7407fb2df38012839bfb94
diff --git a/plat/arm/board/arm_fpga/platform.mk b/plat/arm/board/arm_fpga/platform.mk
index c9425c5..c31697e 100644
--- a/plat/arm/board/arm_fpga/platform.mk
+++ b/plat/arm/board/arm_fpga/platform.mk
@@ -60,7 +60,6 @@
 # AArch64-only cores
 	FPGA_CPU_LIBS	+=	lib/cpus/aarch64/cortex_a510.S			\
 				lib/cpus/aarch64/cortex_a520.S			\
-				lib/cpus/aarch64/cortex_a710.S			\
 				lib/cpus/aarch64/cortex_a715.S			\
 				lib/cpus/aarch64/cortex_a720.S			\
 				lib/cpus/aarch64/cortex_x3.S 			\