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/cmd/gpt.c b/cmd/gpt.c
index f2b1ad5..c2964d8 100644
--- a/cmd/gpt.c
+++ b/cmd/gpt.c
@@ -11,9 +11,11 @@
  */
 
 #include <common.h>
+#include <blk.h>
 #include <env.h>
 #include <malloc.h>
 #include <command.h>
+#include <part.h>
 #include <part_efi.h>
 #include <exports.h>
 #include <uuid.h>