serial: imx: regression triggered by newly introduced DSR irq handling

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Hey Uwe,

here on a imx6sx board newly introduced DSR-irq-handling breaks serial
console and network support.

Reverting commit 27e16501052e5341934d3 "serial: imx: implement DSR irq
handling for DTE mode" fixes the issue.

The underlying cause is the RMII network configuration where register
bit SION in IOMUXC_SW_MUX_CTL_PAD_ENET1_TX_CLK is necessary. But this
also falsely feeds signal UART1_DTR_B and triggers DSR irq...

Can we revert this commit or add a quirk for RMII-SION configs or make
this optional by a device tree option?

 Thanks
  -- Christoph

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