staging: exfat: make staging/exfat and fs/exfat mutually exclusive

Make staging/exfat and fs/exfat mutually exclusive to select the one
between two same filesystem.

Suggested-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Sungjong Seo <sj1557.seo@samsung.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Pali Rohár <pali.rohar@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/drivers/staging/exfat/Kconfig b/drivers/staging/exfat/Kconfig
index 292a19d..9a0fcce 100644
--- a/drivers/staging/exfat/Kconfig
+++ b/drivers/staging/exfat/Kconfig
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0
 config STAGING_EXFAT_FS
 	tristate "exFAT fs support"
-	depends on BLOCK
+	depends on BLOCK && !EXFAT_FS
 	select NLS
 	help
 	  This adds support for the exFAT file system.