plat/arm: Mark arm platform initialization functions

Mark the initialization functions found in the BL31 boot sequence
as __init so they can be reclaimed when no longer needed.

Change-Id: I687a89346419c7710ef5097feaa325d83c527697
Signed-off-by: Daniel Boulby <daniel.boulby@arm.com>
diff --git a/plat/arm/board/fvp/fvp_common.c b/plat/arm/board/fvp/fvp_common.c
index 3f7857e..aa4f839 100644
--- a/plat/arm/board/fvp/fvp_common.c
+++ b/plat/arm/board/fvp/fvp_common.c
@@ -241,7 +241,7 @@
  * these platforms. This information is stored in a per-BL array to allow the
  * code to take the correct path.Per BL platform configuration.
  ******************************************************************************/
-void fvp_config_setup(void)
+void __init fvp_config_setup(void)
 {
 	unsigned int rev, hbi, bld, arch, sys_id;
 
@@ -331,7 +331,7 @@
 }
 
 
-void fvp_interconnect_init(void)
+void __init fvp_interconnect_init(void)
 {
 #if FVP_INTERCONNECT_DRIVER == FVP_CCN
 	if (ccn_get_part0_id(PLAT_ARM_CCN_BASE) != CCN_502_PART0_ID) {