ARM: tegra: tegra_defconfig updates

ARM: tegra: tegra_defconfig updates

AT24C EEPROM:

This is used for the board ID EEPROM on Jetson TK1, as well as likely
a whole slew of other NVIDIA reference boards; we simply haven't added
enabled the EEPROM in the DT files until now.

MTD_SPI_NOR

This defconfig contains the CONFIG_M25P80 symbol, which is now
dependent on the MTD_SPI_NOR symbol. Add CONFIG_MTD_SPI_NOR to satisfy
the new dependency.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>