arm64: defconfig: Enable Qualcomm PM8XXX vibrator support

The pm8xxx-vibrator driver controls the vibrator motor driver
available in the Qualcomm PM8916 PMIC.
Build the driver as module so it can be loaded when necessary.
Signed-off-by: NStephan Gerhold <stephan@gerhold.net>
Signed-off-by: NBjorn Andersson <bjorn.andersson@linaro.org>

arch/arm64/configs/defconfig

@@ -320,6 +320,7 @@ CONFIG_INPUT_TOUCHSCREEN=y
 CONFIG_TOUCHSCREEN_ATMEL_MXT=m
 CONFIG_INPUT_MISC=y
 CONFIG_INPUT_PM8941_PWRKEY=y
+CONFIG_INPUT_PM8XXX_VIBRATOR=m
 CONFIG_INPUT_HISI_POWERKEY=y
 # CONFIG_SERIO_SERPORT is not set
 CONFIG_SERIO_AMBAKMI=y