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>
diff --git a/configs/cei-tk1-som_defconfig b/configs/cei-tk1-som_defconfig
index 58d75a5..0c4627a 100644
--- a/configs/cei-tk1-som_defconfig
+++ b/configs/cei-tk1-som_defconfig
@@ -12,6 +12,7 @@
 CONFIG_SYS_PROMPT="Tegra124 (TK1-SOM) # "
 CONFIG_TEGRA124=y
 CONFIG_TARGET_CEI_TK1_SOM=y
+CONFIG_TEGRA_ENABLE_UARTD=y
 CONFIG_TEGRA_GPU=y
 CONFIG_ARMV7_PSCI_0_1=y
 CONFIG_SYS_LOAD_ADDR=0x81000000