ARM: tegra: Update default configuration

Changes contributed by Marcel Ziswiler <marcel.ziswiler@toradex.com>:

  Enable HDA to support audio over HDMI and codecs connected to the HDA
  controller (needed by the Toradex Apalis Tegra30 Evaluation Board):
  - SND_HDA
  - SND_HDA_TEGRA
  - SND_HDA_INPUT_BEEP
  - SND_HDA_INPUT_JACK
  - SND_HDA_PATCH_LOADER
  - SND_HDA_CODEC_REALTEK
  - SND_HDA_CODEC_HDMI
  - SND_HDA_GENERIC

  Enable watchdog support:
  - WATCHDOG
  - TEGRA_WATCHDOG

Signed-off-by: Thierry Reding <treding@nvidia.com>