serial: sirf: assign console default index if users not set a valid one
it seems this is a more typical behaviour from reviewing other console drivers. 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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