topology2: dmic-generic: rename volume switch

The volume switch of gain widget is renamed as 'Dmic0 Capture Volume'
for backward compatibility.

Signed-off-by: Brent Lu <brent.lu@intel.com>
(cherry picked from commit 5c3a1ca)
Signed-off-by: Jyri Sarha <jyri.sarha@linux.intel.com>

tools/topology/topology2/platform/intel/dmic-generic.conf

@@ -140,7 +140,7 @@ IncludeByKey.PASSTHROUGH {
 						}
 					]
 					Object.Control.mixer.1 {
-						name '$DMIC0_PCM_NAME Capture Volume'
+						name 'Dmic0 Capture Volume'
 					}
 					Object.Control.mixer.2 {
 						name 'Dmic0 Capture Switch'