omni: Add ROM_BUILDTYPE Weekly soong module

Needed for update_engine where backuptool is only requiered on this ROM_BUILDTYPE

Change-Id: I82d78db0f01ca6ce2483a0021ad384381bca6d62
diff --git a/config/BoardConfigSoong.mk b/config/BoardConfigSoong.mk
index 9ca2268..ce0ad6f 100644
--- a/config/BoardConfigSoong.mk
+++ b/config/BoardConfigSoong.mk
@@ -38,6 +38,7 @@
     launcher3Mock \
     targetNeedsHWCOnFirstRef \
     uses_metadata_as_fde_key \
+    useWeekly \
     target_use_sdclang \
     target_camera_needs_client_info \
     target_enforce_ab_ota_partition_list
@@ -79,6 +80,7 @@
 
 SOONG_CONFIG_omniGlobalVars_launcher3Gapps ?= false
 SOONG_CONFIG_omniGlobalVars_launcher3Mock ?= false
+SOONG_CONFIG_omniGlobalVars_useWeekly ?= false
 
 # Soong value variables
 SOONG_CONFIG_omniGlobalVars_additional_gralloc_10_usage_bits := $(TARGET_ADDITIONAL_GRALLOC_10_USAGE_BITS)
@@ -90,3 +92,7 @@
 else
     SOONG_CONFIG_omniGlobalVars_launcher3Mock := true
 endif
+
+ifeq ($(ROM_BUILDTYPE),WEEKLY)
+    SOONG_CONFIG_omniGlobalVars_useWeekly := true
+endif