fbdev changes for 3.19

* support for mx6sl and mx6sx
* OMAP HDMI audio rewrite to make it finally work
* OMAP video PLL work to prepare for new DRA7xx SoCs
* simplefb DT related improvements
Merge branches '3.19/omapdss' and '3.19/simplefb' into fbdev

Merge fbdev topic branches.