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/drivers/cpu/bmips_cpu.c b/drivers/cpu/bmips_cpu.c
index fc04747..613c836 100644
--- a/drivers/cpu/bmips_cpu.c
+++ b/drivers/cpu/bmips_cpu.c
@@ -11,6 +11,7 @@
 #include <cpu.h>
 #include <dm.h>
 #include <errno.h>
+#include <init.h>
 #include <asm/io.h>
 
 #define REV_CHIPID_SHIFT		16