Convert CONFIG_THOR_RESET_OFF to Kconfig

This converts the following to Kconfig:
   CONFIG_THOR_RESET_OFF

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index d93731f..47d2ef0 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -526,6 +526,10 @@
 	  There is no documentation about this within the U-Boot source code
 	  but you should be able to find something on the interwebs.
 
+config THOR_RESET_OFF
+	bool "thor: Disable reset on completion"
+	depends on CMD_THOR_DOWNLOAD
+
 config CMD_ZBOOT
 	bool "zboot - x86 boot command"
 	help