Turn off secure adb for factory builds

adb authentication needs to be off for factory builds, set
ro.adb.secure to '0' instead of no property value.

Bug: 192331246
Test: build and check the property value
Change-Id: I3652e5af3af9a0eca89318596fcdbdcd2eef4fdd
diff --git a/factory_common.mk b/factory_common.mk
index 03092bc..089d9a1 100644
--- a/factory_common.mk
+++ b/factory_common.mk
@@ -18,7 +18,8 @@
 $(call inherit-product-if-exists, vendor/google_devices/gs101/factory/pixel/device-factory.mk)
 
 PRODUCT_PROPERTY_OVERRIDES += service.adb.root=1 \
-                              ro.vendor.factory=1
+                              ro.vendor.factory=1 \
+                              ro.adb.secure=0
 
 # Factory Libraries of Audio
 PRODUCT_PACKAGES += audioroute libaudioroutelite