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/virtio/virtio_blk.c b/drivers/virtio/virtio_blk.c
index e793e34..992118c 100644
--- a/drivers/virtio/virtio_blk.c
+++ b/drivers/virtio/virtio_blk.c
@@ -7,6 +7,7 @@
 #include <common.h>
 #include <blk.h>
 #include <dm.h>
+#include <part.h>
 #include <virtio_types.h>
 #include <virtio.h>
 #include <virtio_ring.h>