gpio: 74x164: Remove non-DT support

Commit 20bc4d5d565159eb2b942bf4b7fae86fba94e32c
(gpio: 74x164: Add support for the daisy-chaining) introduce check
for DT for the driver, so driver cannot be used without DT.
There are no in-tree users of this driver, so remove non-DT support
completely.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Acked-by: Mark Brown <broonie@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index ae3682d..4127f68 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -714,10 +714,10 @@
 
 config GPIO_74X164
 	tristate "74x164 serial-in/parallel-out 8-bits shift register"
-	depends on SPI_MASTER
+	depends on SPI_MASTER && OF
 	help
-	  Platform driver for 74x164 compatible serial-in/parallel-out
-	  8-outputs shift registers. This driver can be used to provide access
+	  Driver for 74x164 compatible serial-in/parallel-out 8-outputs
+	  shift registers. This driver can be used to provide access
 	  to more gpio outputs.
 
 comment "AC97 GPIO expanders:"