drivers/serial: imx: robustify device setup/cleanup
- fix the reset sequence which may have caused random lockups when re-opening the device. - converge to the mainline implementation wrt setting up the UART registers. Signed-off-by:Philippe Gerum <rpm@xenomai.org> Signed-off-by:
Jan Kiszka <jan.kiszka@siemens.com>
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