MLK-24941 arm: dts: set sensor regulator always on for imx6q/qp/dl

MLK-24941 arm: dts: set sensor regulator always on for imx6q/qp/dl

This is a workaround.
Always open the regulator of the sensor to ensure that the
pull-up of i2c3 is 3.3v. Otherwise, there will be a 1.8v high level
pull-up before enable sensor regulator in kernel boot stage.

Reviewed-by: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: Clark Wang <xiaoning.wang@nxp.com>
(cherry picked from commit 6db6c8bf1a60baad7032f92822a0030b077d3602)
(cherry picked from commit a950edcdb7a52362287783386dc5f6404d1a9dd8)