Mark BL31 initialization functions

Mark the initialization functions in BL31, such as context management,
EHF, RAS and PSCI as __init so that they can be reclaimed by the
platform when no longer needed

Change-Id: I7446aeee3dde8950b0f410cb766b7a2312c20130
Signed-off-by: Daniel Boulby <daniel.boulby@arm.com>
diff --git a/bl31/bl31_main.c b/bl31/bl31_main.c
index 4b7f63c..62bea01 100644
--- a/bl31/bl31_main.c
+++ b/bl31/bl31_main.c
@@ -57,7 +57,7 @@
 /*******************************************************************************
  * Simple function to initialise all BL31 helper libraries.
  ******************************************************************************/
-void bl31_lib_init(void)
+void __init bl31_lib_init(void)
 {
 	cm_init();
 }
@@ -149,7 +149,7 @@
  * This function programs EL3 registers and performs other setup to enable entry
  * into the next image after BL31 at the next ERET.
  ******************************************************************************/
-void bl31_prepare_next_image_entry(void)
+void __init bl31_prepare_next_image_entry(void)
 {
 	entry_point_info_t *next_image_info;
 	uint32_t image_type;