serial: sirf: add uart receive's some error counter and mark
add overrun error's flag mark and parity's counter, we can show the statistic from procfs node. BTW, let the indentation of stick bits configuration look better. Signed-off-by: NQipan Li <Qipan.Li@csr.com> Signed-off-by: NBarry Song <Baohua.Song@csr.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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