Modify device.mk for tcpdump_logger

-Add the default value of property
-porting from ag/6552086

Bug: 145724331
Test: build pass
Change-Id: I2395bcf54a6ee8a48e06bf9e8862faa4bceb9890
diff --git a/device-common.mk b/device-common.mk
index 9043092..98f9d73 100644
--- a/device-common.mk
+++ b/device-common.mk
@@ -692,6 +692,13 @@
 else
 endif
 
+# Enable tcpdump_logger on userdebug and eng
+ifneq (,$(filter userdebug eng, $(TARGET_BUILD_VARIANT)))
+    PRODUCT_PROPERTY_OVERRIDES += \
+        persist.vendor.tcpdump.log.alwayson=false \
+        persist.vendor.tcpdump.log.br_num=5
+endif
+
 # Preopt SystemUI
 PRODUCT_DEXPREOPT_SPEED_APPS += \
     SystemUIGoogle