ARM: tegra: update defconfig

Refresh tegra_defconfig:

New options enabled: RTC, SPI, USB and USB_STORAGE together with
corresponding tegra drivers. Also enable some of the common usb ethernet
adapters.

Enable Tegra ALSA/ASoC/sound support, including drivers for TrimSlice,
and WM8903-based platforms such as Harmony and Seaboard.

Finally, enable new merged boards (Ventana) and the generic devicetree board.

Signed-off-by: Olof Johansson <olof@lixom.net>
Acked-by: Stephen Warren <swarren@nvidia.com>