ARM: tegra: add aliases and DMA requestor for serial nodes of Tegra114

ARM: tegra: add aliases and DMA requestor for serial nodes of Tegra114

Add APB DMA requestor and serial aliases for serial controller.
There are two serial drivers i.e. 8250 based simple serial driver
and APB DMA based serial driver for higher baudrate and performace.

The simple serial driver is selected by compatible value
"nvidia,tegra114-uart", "nvidia,tegra20-uart", and the APB DMA based
driver is selected by compatible value "nvidia,tegra114-hsuart",
"nvidia,tegra30-hsuart".

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>