Fix problem with audio policy configuration file.

Having the copy of default audio_policy.conf file in generic_no_telephony.mk
doesn't work because of multiple inheritance on certain products.

Move it to board/generic/device.mk to be consistent with how the audio HAL
modules are managed.

Issue 6333980.

Change-Id: If6053ad596b6f693f43c72ba9cc54cb7a7cfa233
diff --git a/target/board/generic/device.mk b/target/board/generic/device.mk
index ca18365..f8e5162 100644
--- a/target/board/generic/device.mk
+++ b/target/board/generic/device.mk
@@ -27,6 +27,7 @@
     development/data/etc/vold.conf:system/etc/vold.conf \
     development/tools/emulator/system/camera/media_profiles.xml:system/etc/media_profiles.xml \
     development/tools/emulator/system/camera/media_codecs.xml:system/etc/media_codecs.xml \
+    hardware/libhardware_legacy/audio/audio_policy.conf:system/etc/audio_policy.conf
 
 PRODUCT_PACKAGES := \
     audio.primary.goldfish \