arm64: tegra: Enable UART instance on 40-pin header
On P3737 board, UART-A is available on 40-pin header. Enable UART-A for P3737 and change the compatible string to "nvidia,tegra194-hsuart". This allows supporting HW flow control and is the preferred choice for higher baud rates. Signed-off-by: kartik <kkartik@nvidia.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
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