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