Nexus 6: b1-t2-M

I've played around with the M sources and added some little fixes for it. I've also made an "M" build with mako_hotplug.

Changelog:
-added some fixes for several subsystems (audio, video, gpu and mdss)
-added a mako_hotplug build

hC-b1-t2-M

hC-b1-t2-mako-M

Have fun! (=

hells