Export OMNI_PRODUCT_PROPERTIES to soong

Change-Id: Ifa660cacb8ac6068f638ce8d15d5ec525c167aac
diff --git a/core/soong_extra_config.mk b/core/soong_extra_config.mk
index 2d0c2d8..6f370c5 100644
--- a/core/soong_extra_config.mk
+++ b/core/soong_extra_config.mk
@@ -44,6 +44,7 @@
 $(call add_json_list, PRODUCT_ODM_PROPERTIES,            $(call collapse-prop-pairs,PRODUCT_ODM_PROPERTIES))
 $(call add_json_list, PRODUCT_PROPERTY_OVERRIDES,        $(call collapse-prop-pairs,PRODUCT_PROPERTY_OVERRIDES))
 
+$(call add_json_list, OMNI_PRODUCT_PROPERTIES,      $(call collapse-prop-pairs,OMNI_PRODUCT_PROPERTIES))
 $(call add_json_list, PRODUCT_BUILD_PROP_OVERRIDES,      $(call collapse-prop-pairs,PRODUCT_BUILD_PROP_OVERRIDES))
 
 $(call add_json_str, BootloaderBoardName, $(TARGET_BOOTLOADER_BOARD_NAME))