ALSA: hdsp - Correct HDSP_VERSION_BIT constant, thus partly fixing RPM detection

HDSP_VERSION_BIT has to be ORed with HDSP_S_LOAD. This fixes the detection
of at least some RME RPM boxes.

Signed-off-by: Adrian Knoth <adi@drcomp.erfurt.thur.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>