common: Drop linux/printk.h from common header

This old patch was marked as deferred. Bring it back to life, to continue
towards the removal of common.h

Move this out of the common header and include it only where needed.

Signed-off-by: Simon Glass <sjg@chromium.org>

drivers/mtd/ubi/debug.h

@@ -17,6 +17,7 @@ void ubi_dump_vid_hdr(const struct ubi_vid_hdr *vid_hdr);
 #endif
 
 #include <hexdump.h>
+#include <linux/printk.h>
 
 #ifndef __UBOOT__
 #define ubi_assert(expr)  do {                                               \