common: Drop part.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/block/blkcache.c b/drivers/block/blkcache.c
index ea40929..6a8f789 100644
--- a/drivers/block/blkcache.c
+++ b/drivers/block/blkcache.c
@@ -4,8 +4,8 @@
  * Author: Eric Nelson<eric@nelint.com>
  *
  */
-#include <config.h>
 #include <common.h>
+#include <blk.h>
 #include <malloc.h>
 #include <part.h>
 #include <linux/ctype.h>