Convert CONFIG_TEGRA_ENABLE_UARTA et al to Kconfig

This converts the following to Kconfig:
   CONFIG_TEGRA_ENABLE_UARTA
   CONFIG_TEGRA_ENABLE_UARTB
   CONFIG_TEGRA_ENABLE_UARTC
   CONFIG_TEGRA_ENABLE_UARTD
   CONFIG_TEGRA_SPI
   CONFIG_TEGRA_UARTA_GPU
   CONFIG_TEGRA_UARTA_SDIO1
   CONFIG_TEGRA_VDD_CORE_TPS62361B_SET3
   CONFIG_TEGRA_VDD_CORE_TPS62366A_SET1

Signed-off-by: Tom Rini <trini@konsulko.com>