serial: sh-sci: Use a bitmask to indicate supported sampling rates
Replace the single sampling rate and special handling for HSCIF's variable sampling rates by a bitmask and a custom iterator. This prepares for the advent of SCIFA/SCIFB's sparse variable sampling rates. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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