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/nvme/nvme-uclass.c b/drivers/nvme/nvme-uclass.c
index 2d88efd..277e31e 100644
--- a/drivers/nvme/nvme-uclass.c
+++ b/drivers/nvme/nvme-uclass.c
@@ -5,6 +5,7 @@
  */
 
 #include <common.h>
+#include <blk.h>
 #include <errno.h>
 #include <dm.h>
 #include <dm/device.h>