mount bind /system/bin/adbd /sbin/adbd before adbd starts

This is needed for master on A-only devices
diff --git a/vndk-detect b/vndk-detect
index b92de6c..3529a8a 100644
--- a/vndk-detect
+++ b/vndk-detect
@@ -8,3 +8,5 @@
 while read version;do
 	setprop persist.sys.vndk $version
 done
+
+mount -o bind /system/bin/adbd /sbin/adbd