ARM: dts: imx6q: add anatop regulators

Add anatop regulators to imx6q.dtsi for all imx6q platforms.

Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>
Signed-off-by: Richard Zhao <richard.zhao@linaro.org>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>