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/board/barco/platinum/spl_titanium.c b/board/barco/platinum/spl_titanium.c
index 263371a..8c91b752 100644
--- a/board/barco/platinum/spl_titanium.c
+++ b/board/barco/platinum/spl_titanium.c
@@ -8,6 +8,7 @@
 
 #include <common.h>
 #include <i2c.h>
+#include <init.h>
 #include <asm/io.h>
 #include <asm/arch/iomux.h>
 #include <asm/arch/mx6-ddr.h>