dts: msm8974pro: initial Krait 8974AB overclocking

Signed-off-by: Paul Reioux <reioux@gmail.com>

Conflicts:
	arch/arm/boot/dts/msm8974pro.dtsi
DTS: adjust the regulator settings to support OC

Signed-off-by: Paul Reioux <reioux@gmail.com>
dts: msm8974pro: overclocking tweak for 3.0 GHz

Signed-off-by: Paul Reioux <reioux@gmail.com>
dts: regulator update for 3.0 GHz overclocking

Signed-off-by: Paul Reioux <reioux@gmail.com>
dts: reduce OC to 2.88 GHz max

Signed-off-by: Paul Reioux <reioux@gmail.com>
dts: introduce 268MHz clock