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/i386/interrupt.c b/arch/x86/cpu/i386/interrupt.c
index 78aa51a..991cf5c 100644
--- a/arch/x86/cpu/i386/interrupt.c
+++ b/arch/x86/cpu/i386/interrupt.c
@@ -13,6 +13,7 @@
 #include <common.h>
 #include <dm.h>
 #include <efi_loader.h>
+#include <init.h>
 #include <irq_func.h>
 #include <asm/control_regs.h>
 #include <asm/i8259.h>