Add microdroid-specialized KeyMint service

KeyMint in microdroid will initially be a specialized version of the
software KeyMint reference implementation. Begin this specialization by
removing the services that aren't needed within VMs.

Bug: 190578423
Test: atest MicrodroidHostTestCases
Change-Id: I6eee95944ccc555656868dad193f29b83ebf46a4
diff --git a/microdroid/init.rc b/microdroid/init.rc
index 4410b82..b683230 100644
--- a/microdroid/init.rc
+++ b/microdroid/init.rc
@@ -101,7 +101,7 @@
     start keystore2
 
 on late-fs
-    start vendor.keymint-default
+    start vendor.keymint-microdroid
 
     # TODO(b/185767624): change the hard-coded size?
     mount tmpfs tmpfs /data noatime nosuid nodev rw size=128M