gpio: qcom_pmic: drop pon GPIO driver

Remove the (now unused) GPIO driver for the power and resin buttons on
the PMIC.

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Sumit Garg <sumit.garg@linaro.org>
Tested-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 63e62e1..27df5d8 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -318,12 +318,11 @@
 config QCOM_PMIC_GPIO
 	bool "Qualcomm generic PMIC GPIO/keypad driver"
 	depends on DM_GPIO && PMIC_QCOM
+	select BUTTON
 	help
 	  Support for GPIO pins and power/reset buttons found on
 	  Qualcomm SoCs PMIC.
-	  Default name for GPIO bank is "pm8916".
-	  Power and reset buttons are placed in "pwkey_qcom" bank and
-          have gpio numbers 0 and 1 respectively.
+	  The GPIO bank is called "pmic"
 
 config PCF8575_GPIO
 	bool "PCF8575 I2C GPIO Expander driver"