Update the Tegra default configuration for the following features:

  - expose hardware/virtual IRQ mapping via debugfs
  - WM9712 audio/touch controller as found on Colibri T20
  - sysfs interface for GPIOs
  - NFS client support for NFS version 4
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>