beckham: AB_OTA_UPDATER is BoardConfig variable

Bug: 130433003
Test: TreeHugger
Change-Id: I70c7a884df45781e8b14339edd02985ba3de02fd

BoardConfig.mk

@@ -19,6 +19,14 @@
 
 DEVICE_PATH := device/motorola/beckham
 
+# A/B updater
+AB_OTA_UPDATER := true
+
+AB_OTA_PARTITIONS += \
+    boot \
+    system \
+    vendor
+
 # Assertions
 TARGET_OTA_ASSERT_DEVICE := beckham
 

lineage_beckham.mk

@@ -26,13 +26,6 @@ $(call inherit-product, $(SRC_TARGET_DIR)/product/product_launched_with_o_mr1.mk
 $(call inherit-product, device/motorola/beckham/device.mk)
 
 # A/B updater
-AB_OTA_UPDATER := true
-
-AB_OTA_PARTITIONS += \
-    boot \
-    system \
-    vendor
-
 AB_OTA_POSTINSTALL_CONFIG += \
     RUN_POSTINSTALL_system=true \
     POSTINSTALL_PATH_system=system/bin/otapreopt_script \