ARM: tegra: defconfig updates

Enable:
* SYSVIPC (needed for some apps, e.g. fakeroot).
* Elantech touchpad (touchpad on AC100).
* SCSI_MULTI_LUN (needed for some USB SD card readers).
* PCI, MSI, and Tegra's PCIe driver.
* USB XHCI; useful for testing PCIe.

Signed-off-by: Marc Dietrich <marvin24@gmx.de>
Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>