serial: xilinx_uartps: remove superfluous IDR write
The datesheet clearly states, that writing low bits to the XUARTPS_IDR register have no effect. Remove the write. Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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