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/disk/part_mac.c b/disk/part_mac.c
index fbd0ad7..cda497e 100644
--- a/disk/part_mac.c
+++ b/disk/part_mac.c
@@ -17,6 +17,7 @@
 #include <memalign.h>
 #include <ide.h>
 #include "part_mac.h"
+#include <part.h>
 
 #ifdef CONFIG_HAVE_BLOCK_DEVICE