shieldtablet: Add missing libgov_gpucompute.so

E/phs:governor(14217): failed to load "libgov_gpucompute.so": No such file or directory
shieldtablet: Build libaudio-resampler

Could not open audio-resampler library: dlopen failed: library "libaudio-resampler.so" not found
shieldtablet: Remove useless attempts at adb in recovery
shieldtablet: Long Term Orbits (LTO)

Change-Id: I02c62e481d15b60fcf322a09e6925f860e060745
shieldtablet: Mount external storage devices vfat

Change-Id: I375418029f9b6452f9b49639ec8ccb98bd690acb
shieldtablet: Add L1 DRM blobs from official nvidia build

Change-Id: Ia7325d668cca1fb5b555d6a3438de6dd2315ff01