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Add support for CONSOLE_MUX to tegra-kbc driver. This requires adding a flag to struct keyb to know the driver has already been initialized so if we try to initialize it again we can just return success. Also call into iomux_doenv() from drv_keyboard_init to re-evaluate the stdin string. Signed-off-by: Allen Martin <amartin@nvidia.com> Signed-off-by: Tom Warren <twarren@nvidia.com>