fastboot: Depend on CMDLINE

Much of the functionality of fastboot relies on being able to run
commands as defined in the environment. This means it does depend on
CMDLINE being enabled.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/fastboot/Kconfig b/drivers/fastboot/Kconfig
index 837c6f1..11fc0fe 100644
--- a/drivers/fastboot/Kconfig
+++ b/drivers/fastboot/Kconfig
@@ -1,4 +1,5 @@
 menu "Fastboot support"
+	depends on CMDLINE
 
 config FASTBOOT
 	bool