dragonboard: pixel3_mainline: Include firmware/device.mk if available am: 8a11a96d35 am: 1dda2168c9 am: dc45c18db6 am: c786311d77

Change-Id: Ic0b411e83302e10db2e129a82c316642dc78b900
diff --git a/pixel3_mainline/device.mk b/pixel3_mainline/device.mk
index aab118b..a6d53f0 100644
--- a/pixel3_mainline/device.mk
+++ b/pixel3_mainline/device.mk
@@ -28,3 +28,6 @@
 
 # Build generic Audio HAL
 PRODUCT_PACKAGES := audio.primary.pixel3_mainline
+
+# Copy firmware files
+$(call inherit-product-if-exists, $(LOCAL_PATH)/firmware/device.mk)