common: Drop init.h from common header

Move this uncommon header out of the common header.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/mach-mediatek/mt8518/init.c b/arch/arm/mach-mediatek/mt8518/init.c
index c46cc5f..531a403 100644
--- a/arch/arm/mach-mediatek/mt8518/init.c
+++ b/arch/arm/mach-mediatek/mt8518/init.c
@@ -11,6 +11,7 @@
 #include <cpu_func.h>
 #include <dm.h>
 #include <fdtdec.h>
+#include <init.h>
 #include <ram.h>
 #include <asm/arch/misc.h>
 #include <asm/armv8/mmu.h>