arm64: defconfig: Enable PM8916 watchdog driver

Enable watchdog driver for pm8916 block. It is used on msm8916/apq8016
platforms (e.g. Dragonboard 410c).
Signed-off-by: Aníbal Limón <anibal.limon@linaro.org>
[DB: changed to =m, expanded commit message]
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220131202721.2122605-1-dmitry.baryshkov@linaro.org

arch/arm64/configs/defconfig

@@ -622,6 +622,7 @@ CONFIG_ARM_SMC_WATCHDOG=y
 CONFIG_RENESAS_WDT=y
 CONFIG_RENESAS_RZG2LWDT=y
 CONFIG_UNIPHIER_WATCHDOG=y
+CONFIG_PM8916_WATCHDOG=m
 CONFIG_BCM2835_WDT=y
 CONFIG_MFD_ALTERA_SYSMGR=y
 CONFIG_MFD_BD9571MWV=y