DT: add binding for MXS regulator

This patch adds the Device tree bindings for the Freescale MXS on-chip
regulators.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
regulator: add mxs regulator driver

This patch adds driver support for Freescale i.MX23, i.MX28
on-chip regulators. The driver supports the following regulators:
vddd, vdda and vddio.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
ARM: dts: enable regulator support for i.MX28

This patch enables the on-chip regulator support for all i.MX28 boards.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
ARM: dts: enable regulator support for i.MX23

This patch enables the on-chip regulator support for all i.MX23 boards.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>