dm: blk: Rename get_device_and_partition()

Rename this function to blk_get_device_part_str(). This is a better name
because it makes it clear that the function returns a block device and
parses a string.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Stephen Warren <swarren@nvidia.com>
diff --git a/cmd/part.c b/cmd/part.c
index dd32d50..415b38a 100644
--- a/cmd/part.c
+++ b/cmd/part.c
@@ -37,7 +37,7 @@
 	if (argc > 3)
 		return CMD_RET_USAGE;
 
-	part = get_device_and_partition(argv[0], argv[1], &dev_desc, &info, 0);
+	part = blk_get_device_part_str(argv[0], argv[1], &dev_desc, &info, 0);
 	if (part < 0)
 		return 1;