tegra2: spi: Support SPI / UART switch
Add the SPI / UART switch logic into the Tegra2 SPI driver so that it can co-exist with the NS16550 UART. We need the ns16550.h header for NS16550_t for now. Signed-off-by: NSimon Glass <sjg@chromium.org> Signed-off-by: NTom Warren <twarren@nvidia.com>
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