[ALSA] hdsp - RME 9632 fix at 192kHz

The bits indicating SPDIF frequency in the status register are not the same for
the 9632 than for the other cards, because it also supports 192kHz. A specific
bitmask has thus been added (used in hdsp_spdif_sample_rate()).
The 9632 does not seem to report external sample rates greater than 96kHz. In
this case, the best seems to report spdif rate when autosync reference is
spdif. This also required to move function hdsp_spdif_sample_rate().

Signed-off-by: Remy Bruno <remy.bruno@trinnov.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>