common: Drop log.h from common header

Move this header out of the common header.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/usb/gadget/f_mass_storage.c b/drivers/usb/gadget/f_mass_storage.c
index 5250fc8..1a181bd 100644
--- a/drivers/usb/gadget/f_mass_storage.c
+++ b/drivers/usb/gadget/f_mass_storage.c
@@ -241,6 +241,7 @@
 
 #include <config.h>
 #include <hexdump.h>
+#include <log.h>
 #include <malloc.h>
 #include <common.h>
 #include <console.h>