ASoC: amd: acp: update dmic_num logic for acp pdm dmic

ASoC: amd: acp: update dmic_num logic for acp pdm dmic

Currently there is no mechanism to read dmic_num in mach_params
structure. In this scenario mach_params->dmic_num check always
returns 0 which fails to add component string for dmic.
Update the condition check with acp pdm dmic quirk check and
pass the dmic_num as 1.

Fixes: 2981d9b0789c ("ASoC: amd: acp: add soundwire machine driver for legacy stack")
Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@amd.com>
Link: https://patch.msgid.link/20260330072431.3512358-2-Vijendar.Mukunda@amd.com
Signed-off-by: Mark Brown <broonie@kernel.org>