omni: add ro.omni.fingerprint property for weekly builds

Change-Id: I4925e6a4c73e55970fc47efe8e339bf5277a90c7
diff --git a/config/version.mk b/config/version.mk
index 48f4ac5..119643b 100644
--- a/config/version.mk
+++ b/config/version.mk
@@ -22,3 +22,9 @@
 PRODUCT_PROPERTY_OVERRIDES += \
     ro.modversion=OmniROM-$(ROM_VERSION) \
     ro.omni.version=$(ROM_VERSION)
+
+ifeq ($(ROM_BUILDTYPE),WEEKLY)
+    ROM_FINGERPRINT := OmniROM/$(PLATFORM_VERSION)/$(TARGET_PRODUCT_SHORT)/$(shell date +%Y%m%d)
+    PRODUCT_PROPERTY_OVERRIDES += \
+        ro.omni.fingerprint=$(ROM_FINGERPRINT)
+endif