ALSA/hda: intel-dsp-config: Document AVS as dsp_driver option

dsp_driver=4 will force the AVS driver stack to be used, it is better to
docuement this.

Fixes: 1affc44e ("ASoC: Intel: avs: PCI driver implementation")
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://lore.kernel.org/r/20240607060021.11503-1-peter.ujfalusi@linux.intel.comSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/hda/intel-dsp-config.c

@@ -18,7 +18,7 @@
 static int dsp_driver;
 
 module_param(dsp_driver, int, 0444);
-MODULE_PARM_DESC(dsp_driver, "Force the DSP driver for Intel DSP (0=auto, 1=legacy, 2=SST, 3=SOF)");
+MODULE_PARM_DESC(dsp_driver, "Force the DSP driver for Intel DSP (0=auto, 1=legacy, 2=SST, 3=SOF, 4=AVS)");
 
 #define FLAG_SST			BIT(0)
 #define FLAG_SOF			BIT(1)