vendor: props: Don't write binary XML files

- Android 12 now writes XML files in binary format by default. This can cause incompatibility with TWRP which can hang when attempting to read XML files e.g. /data/system/storage.xml

- This commit sets the persist.sys.binary_xml property to false so that XML files are written in text format.

Change-Id: I70be889fd00f7742723e8713b5979e9251379330
diff --git a/config/common.mk b/config/common.mk
index 7efe9eb..5986b9b 100644
--- a/config/common.mk
+++ b/config/common.mk
@@ -173,3 +173,6 @@
 
 -include $(WORKSPACE)/build_env/image-auto-bits.mk
 -include vendor/bliss/config/partner_gms.mk
+
+# System
+persist.sys.binary_xml=false