Add base DTS file for pmm8155au_2 along with GPIOs, power-on, rtc and vadc
nodes.

Cc: Mark Brown <broonie@kernel.org>
Cc: Vinod Koul <vkoul@kernel.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Bhupesh Sharma <bhupesh.sharma@linaro.org>
Link: https://lore.kernel.org/r/20210617054548.353293-5-bhupesh.sharma@linaro.org
[bjorn: Added gpio-ranges to pmm8155au_2_gpios]
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>