common: Drop image.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/pinctrl/pinctrl-sti.c b/drivers/pinctrl/pinctrl-sti.c
index f0cd845..14fcad5 100644
--- a/drivers/pinctrl/pinctrl-sti.c
+++ b/drivers/pinctrl/pinctrl-sti.c
@@ -14,6 +14,7 @@
 #include <syscon.h>
 #include <asm/io.h>
 #include <dm/pinctrl.h>
+#include <linux/libfdt.h>
 
 DECLARE_GLOBAL_DATA_PTR;