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.c b/drivers/nvme/nvme.c
index ef4382d..5e75152 100644
--- a/drivers/nvme/nvme.c
+++ b/drivers/nvme/nvme.c
@@ -5,6 +5,7 @@
  */
 
 #include <common.h>
+#include <blk.h>
 #include <cpu_func.h>
 #include <dm.h>
 #include <errno.h>