This patch adds the basic and regulator bindings for the X-Powers AXP809
PMIC.

Also update the DC-DC converter operating frequency for AXP22X/AXP80X.
Signed-off-by: NChen-Yu Tsai <wens@csie.org>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NLee Jones <lee.jones@linaro.org>