ARM: tegra: update defconfig

Refresh tegra_defconfig:

New options enabled:
* PERF_EVENTS
* Tegra EMC scaling
* Support for all 4 CPUs on Tegra30
* AUTO_ZRELADDR for unified Tegra20+Tegra30 images
* CPU_FREQ/CPU_IDLE
* BLK_DEV_SR
* INPUT_EVDEV
* Regulators, including fixed, GPIO, TPS6586x
* Audio for Tegra+ALC5632 (for Paz00/Toshiba AC100)
* NVEC (staging, for Paz00/Toshiba AC100)
* IOMMU for Tegra20's GART and Tegra30's SMMU
* TEGRA_AES
* ext4, for trim support on SD/eMMC

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