serial: lpuart: Move CONFIG_FSL_LPUART to Kconfig
LPUART is seen on Freescale VF610 and QorIQ Layerscape devices. Create a Kconfig option and move it to defconfig for all boards that have this serial driver. Signed-off-by: NBin Meng <bmeng.cn@gmail.com> Reviewed-by: NSimon Glass <sjg@chromium.org> Acked-by: NStefan Agner <stefan.agner@toradex.com> Acked-by: NSimon Glass <sjg@chromium.org>
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