exynos9820-common: Explicitly set as an non-AB target

We will be changing AB to be the default, existing non-AB targets
need to explicitly set AB_OTA_UPDATER to false

Test: th
Change-Id: I86a76296937a6abab1b4495cd66a35144348aafd
diff --git a/common.mk b/common.mk
index 42382d0..6882930 100644
--- a/common.mk
+++ b/common.mk
@@ -334,6 +334,7 @@
     vendor.lineage.touch@1.0-service.samsung
 
 # Update
+AB_OTA_UPDATER := false
 PRODUCT_SOONG_NAMESPACES += bootable/deprecated-ota
 
 # USB