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>
diff --git a/cmd/usb_gadget_sdp.c b/cmd/usb_gadget_sdp.c
index 748aa0a..cbdda73 100644
--- a/cmd/usb_gadget_sdp.c
+++ b/cmd/usb_gadget_sdp.c
@@ -11,6 +11,7 @@
 #include <g_dnl.h>
 #include <sdp.h>
 #include <usb.h>
+#include <linux/printk.h>
 
 static int do_sdp(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {