Convert CONFIG_CMD_REISER to Kconfig

This converts the following to Kconfig:
   CONFIG_CMD_REISER

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index 2caa0b4..d623a43 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -1275,6 +1275,15 @@
 	  at least as large as the size specified in the mtdparts variable and
 	  2) each partition starts on a good block.
 
+config CMD_REISER
+	bool "reiser - Access to reiserfs filesystems"
+	help
+	  This provides two commands which operate on a resierfs filesystem,
+	  commonly used some years ago:
+
+	    reiserls - list files
+	    reiserload - load a file
+
 endmenu
 
 menu "Debug commands"