O6R4: Enable UDFPS ALS feed forward

Bug: 197789721
Test: Perform fingerprint authentication test with solar simulator.
Change-Id: I716056279206490e0aa01f72333703349b79e13b
diff --git a/device-raven.mk b/device-raven.mk
index 4145e61..ac526ed 100644
--- a/device-raven.mk
+++ b/device-raven.mk
@@ -195,7 +195,9 @@
 
 # Fingerprint HAL
 PRODUCT_VENDOR_PROPERTIES += \
-    persist.vendor.udfps.lhbm_controlled_in_hal_supported=true
+    persist.vendor.udfps.lhbm_controlled_in_hal_supported=true \
+    persist.vendor.udfps.als_feed_forward_supported=true
+
 
 # Keyboard side padding in dp for portrait mode
 PRODUCT_PRODUCT_PROPERTIES += ro.com.google.ime.kb_pad_port_r=11