Move GIC setup to a separate file

GIC setup code which used to be in bl31_plat_setup.c is now in fvp_gic.c
to simplify future changes to other bootloader stages.  This patch moves
code from bl31_plat_setup.c to fvp_gic.c, simplifies the include file
list for bl31_plat_setup.c, moves GIC declarations from the bl31.h header
file into the platform.h, and reworks files according to coding style
guide.

Change-Id: I48d82a4ba33e7114dcc88f9ca98767a06cf8f417
diff --git a/plat/fvp/platform.h b/plat/fvp/platform.h
index 38bd558..af61488 100644
--- a/plat/fvp/platform.h
+++ b/plat/fvp/platform.h
@@ -57,8 +57,8 @@
 #define PLATFORM_CLUSTER_COUNT		2ull
 #define PLATFORM_CLUSTER0_CORE_COUNT	4
 #define PLATFORM_CLUSTER1_CORE_COUNT	4
-#define PLATFORM_CORE_COUNT             (PLATFORM_CLUSTER1_CORE_COUNT + \
-			       		 PLATFORM_CLUSTER0_CORE_COUNT)
+#define PLATFORM_CORE_COUNT		(PLATFORM_CLUSTER1_CORE_COUNT + \
+						PLATFORM_CLUSTER0_CORE_COUNT)
 #define PLATFORM_MAX_CPUS_PER_CLUSTER	4
 #define PRIMARY_CPU			0x0
 
@@ -333,6 +333,12 @@
 extern unsigned long plat_get_ns_image_entrypoint(void);
 extern unsigned long platform_get_stack(unsigned long mpidr);
 
+/* Declarations for fvp_gic.c */
+extern void gic_cpuif_deactivate(unsigned int);
+extern void gic_cpuif_setup(unsigned int);
+extern void gic_pcpu_distif_setup(unsigned int);
+extern void gic_setup(void);
+
 /* Declarations for fvp_topology.c */
 extern int plat_setup_topology(void);
 extern int plat_get_max_afflvl(void);