dm: block: Rename device number member dev to devnum

This is a device number, and we want to use 'dev' to mean a driver model
device. Rename the member.

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/mmc_spi.c b/cmd/mmc_spi.c
index a2138b8..0c44d06 100644
--- a/cmd/mmc_spi.c
+++ b/cmd/mmc_spi.c
@@ -72,8 +72,8 @@
 		printf("Failed to create MMC Device\n");
 		return 1;
 	}
-	printf("%s: %d at %u:%u hz %u mode %u\n", mmc->cfg->name, mmc->block_dev.dev,
-	       bus, cs, speed, mode);
+	printf("%s: %d at %u:%u hz %u mode %u\n", mmc->cfg->name,
+	       mmc->block_dev.devnum, bus, cs, speed, mode);
 	mmc_init(mmc);
 	return 0;