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/ata/sata_mv.c b/drivers/ata/sata_mv.c
index 7f51fb6..552c532 100644
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -33,6 +33,7 @@
 
 #include <common.h>
 #include <ahci.h>
+#include <blk.h>
 #include <cpu_func.h>
 #include <dm.h>
 #include <asm/cache.h>