initcall: Support manual relocation

Move the manual-relocation code to the initcall file. Make sure to avoid
manually relocating event types. Only true function pointers should be
relocated.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/board_r.c b/common/board_r.c
index 8586086..7c1fbc6 100644
--- a/common/board_r.c
+++ b/common/board_r.c
@@ -813,10 +813,8 @@
 #endif
 	gd->flags &= ~GD_FLG_LOG_READY;
 
-	if (IS_ENABLED(CONFIG_NEEDS_MANUAL_RELOC)) {
-		for (int i = 0; i < ARRAY_SIZE(init_sequence_r); i++)
-			MANUAL_RELOC(init_sequence_r[i]);
-	}
+	if (IS_ENABLED(CONFIG_NEEDS_MANUAL_RELOC))
+		initcall_manual_reloc(init_sequence_r);
 
 	if (initcall_run_list(init_sequence_r))
 		hang();