serial: sc16is7xx: depend on I2C

Signed-off-by: Jon Ringle <jringle@gridpoint.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index c3e2b32..64c5659 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -1180,6 +1180,7 @@
 
 config SERIAL_SC16IS7XX
 	tristate "SC16IS7xx serial support"
+	depends on I2C
 	select SERIAL_CORE
 	select REGMAP_I2C if I2C
 	help