tuna: adapt keylayouts to 5.0
hwc: Add option to ignore fb1.

With Lollipop, HWC 1.0 and secondary displays don't play well together.
So we might as well just disable it and save 16MB of RAM.
Add OMAP_TUNA := true to BoardConfig.

For the speex resampling, and possibly other things to come in the future.