pinctrl: qcom: fix compiler errors.

These patches are not in mainline yet, so recent changes in the apis
introduced below compiler errors.

drivers/pinctrl/qcom/pinctrl-spmi-pmic-gpio.c:345:12: warning: ‘pmic_gpio_pinmux_enable’ defined but not used [-Wunused-function]
drivers/pinctrl/qcom/pinctrl-spmi-pmic-gpio.c: In function ‘pmic_gpio_remove’:
rivers/pinctrl/qcom/pinctrl-spmi-pmic-gpio.c:913:5: warning: ‘ret’ is used uninitialized in this function [-Wuninitialized]

This patch fixes those errors in various files.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>