dm: scsi: Drop the get_dev() function

This function is implemented by the legacy block functions now. Drop it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/disk/part.c b/disk/part.c
index e70bef5..67cb6c0 100644
--- a/disk/part.c
+++ b/disk/part.c
@@ -29,7 +29,7 @@
 	{.name = "sata", .get_dev = sata_get_dev, },
 #endif
 #if defined(CONFIG_SCSI)
-	{ .name = "scsi", .get_dev = scsi_get_dev, },
+	{ .name = "scsi", },
 #endif
 #if defined(CONFIG_CMD_USB) && defined(CONFIG_USB_STORAGE)
 	{ .name = "usb", },