fp2-common: Fix the vendor path for thermal-engine.conf

Issue: FP2P-308
Issue: FP2P-450
Change-Id: Id515a4ce6ce031e3260bdf3cc46d9439c2d1111e
diff --git a/device.mk b/device.mk
index 9471e61..cd7d183 100644
--- a/device.mk
+++ b/device.mk
@@ -219,7 +219,7 @@
 
 # Thermal
 PRODUCT_COPY_FILES += \
-	device/fairphone/FP2/configs/thermal-engine-8974.conf:vendor/etc/thermal-engine-8974.conf
+	device/fairphone/FP2/configs/thermal-engine-8974.conf:$(TARGET_COPY_OUT_VENDOR)/etc/thermal-engine-8974.conf
 
 # WiFi
 PRODUCT_PACKAGES += \