dm: part: Rename some partition functions

Rename three partition functions so that they start with part_. This makes
it clear what they relate to.

Signed-off-by: Simon Glass <sjg@chromium.org>
Tested-by: Stephen Warren <swarren@nvidia.com>
diff --git a/fs/fat/fat.c b/fs/fat/fat.c
index 2cef3bd..47f077d 100644
--- a/fs/fat/fat.c
+++ b/fs/fat/fat.c
@@ -97,7 +97,7 @@
 	cur_dev = NULL;
 
 	/* Read the partition table, if present */
-	if (get_partition_info(dev_desc, part_no, &info)) {
+	if (part_get_info(dev_desc, part_no, &info)) {
 		if (part_no != 0) {
 			printf("** Partition %d not valid on device %d **\n",
 					part_no, dev_desc->dev);