Add microdroid_launcher

microdroid_launcher is a very thin executable that loads a shared
library and execute the entry function (android_native_main). This is
used to execute a shared library in an APK that is shared from the host
Android.

Bug: 188513012
Test: atest MicrodroidHostTestCases
Change-Id: I0f98eba4c72601adaa27733dae6a51d3852301db
diff --git a/microdroid/Android.bp b/microdroid/Android.bp
index 1fc1b7a..98b2f98 100644
--- a/microdroid/Android.bp
+++ b/microdroid/Android.bp
@@ -45,8 +45,9 @@
     partition_name: "system",
     deps: [
         "init_second_stage",
-        "microdroid_init_rc",
         "microdroid_build_prop",
+        "microdroid_init_rc",
+        "microdroid_launcher",
         "ueventd.rc",
         "libbinder",
         "libbinder_ndk",