serial: sirf: define macro for some magic numbers of USP
this patch clears some magic numbers for offset and bitshift of USP registers. Signed-off-by: Qipan Li <Qipan.Li@csr.com> Signed-off-by: Barry Song <Baohua.Song@csr.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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