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/net/mvpp2.c b/drivers/net/mvpp2.c
index 2906719..1e0db6c 100644
--- a/drivers/net/mvpp2.c
+++ b/drivers/net/mvpp2.c
@@ -34,6 +34,7 @@
 #include <asm/arch/cpu.h>
 #include <asm/arch/soc.h>
 #include <linux/compat.h>
+#include <linux/libfdt.h>
 #include <linux/mbus.h>
 #include <asm-generic/gpio.h>
 #include <fdt_support.h>