display: enable lbe supported property

Added vendor.display.lbe.supported read by hwcomposer.

Bug: 168848203
test: check lbe property
Change-Id: Ia27c17bc280bd01a9ec1a208a2809dde1f321612
diff --git a/device-raven.mk b/device-raven.mk
index b5b8746..488e695 100644
--- a/device-raven.mk
+++ b/device-raven.mk
@@ -90,3 +90,6 @@
 	device/google/gs101/tts/it-it/it-it-x-kda-r21.zvoice:product/tts/google/it-it/it-it-x-kda-r21.zvoice\
 	device/google/gs101/tts/es-es/es-es-x-ana-r22.zvoice:product/tts/google/es-es/es-es-x-ana-r22.zvoice\
 	device/google/gs101/tts/es-es/es-es-x-multi-r22.zvoice:product/tts/google/es-es/es-es-x-multi-r22.zvoice
+
+# Display LBE
+PRODUCT_DEFAULT_PROPERTY_OVERRIDES += vendor.display.lbe.supported=1