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>

cmd/read.c

@@ -50,7 +50,7 @@ int do_read(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	cnt = simple_strtoul(argv[5], NULL, 16);
 
 	if (part != 0) {
-		if (get_partition_info(dev_desc, part, &part_info)) {
+		if (part_get_info(dev_desc, part, &part_info)) {
 			printf("Cannot find partition %d\n", part);
 			return 1;
 		}