sm8450-common: Let build system copy audio manifests

Despite forcing prebuilt audio HAL to be copied at the very end,
it's still built from sources along with all dependencies,
including the non-qmaa manifests.

Change-Id: I64a3611d6ea7b6d013d21dbf2df2b9b4c34963e6

proprietary-files.txt

@@ -433,8 +433,6 @@ vendor/etc/vintf/manifest/android.hardware.security.keymint-service-qti.xml
 vendor/lib64/libqtikeymint.so
 
 # Listen
-vendor/etc/vintf/manifest/manifest_non_qmaa.xml
-vendor/etc/vintf/manifest/manifest_non_qmaa_extn.xml
 vendor/lib64/hw/sound_trigger.primary.taro.so
 vendor/lib64/libeai_fixed.so
 vendor/lib64/libeai_float.so