Add vold and keymint related services

These are for encrypting /data partition. Also vintf related xmls are
added for the services.

Bug: 185767624
Bug: 188013319
Test: boot microdroid
Change-Id: Ie511e2b4f3565fef181cc57588c2e107182f1961
diff --git a/microdroid/microdroid_vendor_manifest.xml b/microdroid/microdroid_vendor_manifest.xml
new file mode 100644
index 0000000..a48e695
--- /dev/null
+++ b/microdroid/microdroid_vendor_manifest.xml
@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<manifest version="1.0" type="device" />