feat(spmd): introduce platform handler for Group0 interrupt

This patch introduces a handler for FVP platform to triage Group0
secure interrupts. Currently, it is empty but serves as a
placeholder for future Group0 interrupt sources.

Moreover, this patch also provides a dummy implementation of the
above mentioned platform hook for QEMU, corstone100, n1sdp and
hikey960 ports.

Change-Id: I01d3451408f47ac313b0af74046cce89f89b85bb
Signed-off-by: Madhukar Pappireddy <madhukar.pappireddy@arm.com>
diff --git a/plat/arm/board/corstone1000/platform.mk b/plat/arm/board/corstone1000/platform.mk
index d891691..3edffe0 100644
--- a/plat/arm/board/corstone1000/platform.mk
+++ b/plat/arm/board/corstone1000/platform.mk
@@ -56,6 +56,7 @@
 			plat/arm/board/corstone1000/common/corstone1000_security.c		\
 			plat/arm/board/corstone1000/common/corstone1000_plat.c		\
 			plat/arm/board/corstone1000/common/corstone1000_pm.c		\
+			plat/arm/board/corstone1000/common/corstone1000_bl31_setup.c	\
 			${CORSTONE1000_CPU_LIBS}					\
 			${CORSTONE1000_GIC_SOURCES}