Remove authfs executable from the host

It was there for early development, but no longer needed now. The
executable is still in microdroid's system image.

Bug: None
Test: TH
Change-Id: Ia689b49a3aae21b2b08dd11d673bfc6013daecb1
diff --git a/apex/Android.bp b/apex/Android.bp
index ccf34fd..0e2d2d4 100644
--- a/apex/Android.bp
+++ b/apex/Android.bp
@@ -18,7 +18,6 @@
     arch: {
         arm64: {
             binaries: [
-                "authfs", // TODO(victorhsieh): move to microdroid once we can run the test in VM.
                 "crosvm",
                 "virtualizationservice",
             ],
@@ -32,7 +31,6 @@
         },
         x86_64: {
             binaries: [
-                "authfs", // TODO(victorhsieh): move to microdroid once we can run the test in VM.
                 "crosvm",
                 "virtualizationservice",
             ],