stdp4028: Allow phase control

When running at very high speeds, the phase control can be adjusted to
improve visual quality.  Make this a module parameter.
arm: dts: imx6q: Add CPU voltage listings

The cpufreq parameter requires voltage listings for the different frequencies.
They are now part of the devicetree file.
arm: dts: imx6q-novena: Add DRM entries for Novena

This adds DRM entries for both internal and external video on Novena.
Export component_master_add_child

This is required to get imx-drm to build as a module.