tegra: apalis_t30: master revamp

Update Apalis T30 as per the following commits

c3691392
tegra: dts: Add serial port details

461be2f9
kconfig: remove redundant "string" type in arch and board Kconfigs

f1ef2b62
kconfig: move CONFIG_DEFAULT_DEVICE_TREE to kconfig

Signed-off-by: Marcel Ziswiler <marcel@ziswiler.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>