[ALSA] oxygen: add 192 kHz SPDIF input support

Change the oxygen_spdif_input_bits_changed() function so that clock
changes on the SPDIF input are correctly detected.  This means that
sample rates greater than 96 kHz are now supported.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>