Add module template files

Current AOSP keybox can be found at:
https://cs.android.com/android/platform/superproject/main/+/main:device/generic/trusty/keymaster_soft_wrapped_attestation_keys.xml

However, the support of parsing private keys in iecs format is not implemented yet.

module/service.sh

@@ -0,0 +1,11 @@
+DEBUG=false
+
+MODDIR=${0%/*}
+
+cd $MODDIR
+
+while true; do
+  ./daemon "$MODDIR" || exit 1
+  # ensure keystore initialized
+  sleep 2
+done &