BACKPORT: UPSTREAM: power: reset: qcom-pon: Add Qcom PON driver

Add support Qualcomm PM8xxx PON which is responsible for reboot
mode support.

Co-developed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
(cherry picked from commit e6a578e2)
Signed-off-by: Khasim Syed Mohammed <khasim.mohammed@linaro.org>