drivers: implement lpc_uart driver

Support for lpc_uart that is a serial driver.

Signed-off-by: Xiaoxu Zeng <zengxiaoxu@huawei.com>
Signed-off-by: Zeng Tao <prime.zeng@hisilicon.com>
Reviewed-by: J

drivers: implement lpc_uart driver

Support for lpc_uart that is a serial driver.

Signed-off-by: Xiaoxu Zeng <zengxiaoxu@huawei.com>
Signed-off-by: Zeng Tao <prime.zeng@hisilicon.com>
Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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