staging: vt6656: Simplify RX finding bit rates

The bit rate can be found by multiplying the rate value by 5.

Use rx_bitrate to compared to sband bitrates removing the need
to find it by hw_value.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Link: https://lore.kernel.org/r/50d3c4b8-6d17-4fae-ce9c-88a50614450f@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>