nvme: Adjust the 'nvme' command to use blk_common_cmd()

Instead of having separate code in the 'nvme' command, adjust it to use
the common function.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/include/config_fallbacks.h b/include/config_fallbacks.h
index 961a83d..d1bde5f 100644
--- a/include/config_fallbacks.h
+++ b/include/config_fallbacks.h
@@ -50,6 +50,7 @@
 	defined(CONFIG_CMD_PART) || \
 	defined(CONFIG_CMD_GPT) || \
 	defined(CONFIG_MMC) || \
+	defined(CONFIG_NVME) || \
 	defined(CONFIG_SYSTEMACE) || \
 	defined(CONFIG_SANDBOX)
 #define HAVE_BLOCK_DEVICE