common: Move ll_boot_init() to init.h

This is an init-related function so belongs in that file. Move it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/x86/cpu/baytrail/valleyview.c b/arch/x86/cpu/baytrail/valleyview.c
index 8882a76..f2e48f4 100644
--- a/arch/x86/cpu/baytrail/valleyview.c
+++ b/arch/x86/cpu/baytrail/valleyview.c
@@ -4,6 +4,7 @@
  */
 
 #include <common.h>
+#include <init.h>
 #include <mmc.h>
 #include <pci_ids.h>
 #include <asm/irq.h>