regulator: add fixes with MT6397 dt-bindings shouldn't reference driver

DT bindings shouldn't reference drivers and they should be OS-agnostic.
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/regulator/mt6397-regulator.txt

-Mediatek MT6397 Regulator Driver
+Mediatek MT6397 Regulator
 
 Required properties:
 - compatible: "mediatek,mt6397-regulator"