disk: dos: rename write_mbr_partition to write_mbr_sector

write_mbr_partition() function name is a bit misleading, so rename it to
write_mbr_sector(). This is a preparation for adding code for writing a
complete MBR partition layout.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
diff --git a/include/part.h b/include/part.h
index 55be724..67b8b2a 100644
--- a/include/part.h
+++ b/include/part.h
@@ -465,14 +465,14 @@
 int is_valid_dos_buf(void *buf);
 
 /**
- * write_mbr_partition() - write DOS MBR
+ * write_mbr_sector() - write DOS MBR
  *
  * @param dev_desc - block device descriptor
  * @param buf - buffer which contains the MBR
  *
  * @return - '0' on success, otherwise error
  */
-int write_mbr_partition(struct blk_desc *dev_desc, void *buf);
+int write_mbr_sector(struct blk_desc *dev_desc, void *buf);
 
 #endif