Add strace to microdroid image

This makes it easier to debug some problems.

Bug: None
Test: use strace in the VM
Change-Id: Iafae572f1f1b66481d28197d5747c308b03b1f6c
diff --git a/microdroid/Android.bp b/microdroid/Android.bp
index 5fb5ab4..a5b2898 100644
--- a/microdroid/Android.bp
+++ b/microdroid/Android.bp
@@ -5,6 +5,7 @@
 microdroid_shell_and_utilities = [
     "reboot",
     "sh",
+    "strace",
     "toolbox",
     "toybox",
 ]