[ALSA] bt87x - Fix the unability of snd-bt87x to recognize AVerMedia Studio

Modules: BT87x driver

The patch siply adds the PCI IDs of AVerMedia Studio No. 103, 203,
and possibly even other versions with the same PCI IDs to the snd-bt87x
driver and sets its default sampling rate to 48 kHz.

Signed-off-by: Martin Drab <drab@kepler.fjfi.cvut.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>