ARM: tegra_defconfig: Enable options useful for Nexus 7 and Acer A500

Enable several very useful options and drivers for hardware that is found
on Nexus 7 and Acer A500 tablet devices. Please note that some drivers may
require firmware files extracted from original Android image.

Link: https://github.com/grate-driver/linux-firmware
Link: https://github.com/grate-driver/alsa-ucm-conf


Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>