arm64: dts: qcom: msm8998-xperia: Add support for gpio vibrator

All smartphones in the Sony Yoshino platforms have got a simple
vibrator hooked to a GPIO: add support for that and add its own
pin configuration.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20210909123733.367248-4-angelogioacchino.delregno@somainline.org