ALSA: oxygen: add HT-Omega eClaro (7284:9783) support

The HT-Omega eClaro is a PCI sound card built on the C-Media CMI8788
(Oxygen HD) controller, with PCI subsystem ID 7284:9783.

Output hardware:
 - AK4396VF stereo DAC: front L/R output, connected via SPI CE0
 - CS4362A 6-channel DAC: surround, center/LFE, and side outputs,
   connected via SPI CE1 with a 3-byte [0x30, reg, val] frame

The CS4362A uses inverse attenuation encoding (0 = 0 dB, 127 = max
attenuation) and a 0.5 dB/step logarithmic scale. Volume TLV is set
to TLV_DB_SCALE(-6350, 50, 0) to match the hardware. The channel-to-
register mapping was verified by listening test:
 - Pair 1 (regs 7/8):   side L/R   (ALSA channels 6/7)
 - Pair 2 (regs 10/11): center/LFE (ALSA channels 4/5)
 - Pair 3 (regs 13/14): rear L/R   (ALSA channels 2/3)

Input hardware:
 - CS5361 stereo ADC: Line In and Mic In capture

GPIO assignments:
 - GPIO 0 (0x0001): CS4362A RESET# (active-low, driven high)
 - GPIO 2/3:        CS5361 M0/M1 (sample rate mode)
 - GPIO 5 (0x0020): front output stage enable (driven high)
 - GPIO 8 (0x0100): headphone amplifier enable

Signed-off-by: Ferus Castor <feruscastor@proton.me>
Assisted-by: Claude:claude-sonnet-4-6
Link: https://patch.msgid.link/20260601015848.128566-1-feruscastor@proton.me
Signed-off-by: Takashi Iwai <tiwai@suse.de>

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