Revert^2 "Add microfuchsia apex that runs in AVF on bootup"

4ae215a64209cfbb0ae4fb2d484a0fb4fa4afc53

The old change is PS1.

The fix involves using libc::c_char and casting to a u8 on x86
architectures.

Test: m com.android.microfuchsia for arm and x86
Change-Id: Ideccd80b4f6a812c1638b31a7b4ad666a5a411b7
diff --git a/microfuchsia/apex/com.android.microfuchsia-file_contexts b/microfuchsia/apex/com.android.microfuchsia-file_contexts
new file mode 100644
index 0000000..13d7286
--- /dev/null
+++ b/microfuchsia/apex/com.android.microfuchsia-file_contexts
@@ -0,0 +1,2 @@
+(/.*)?                   u:object_r:system_file:s0
+/bin/microfuchsiad       u:object_r:microfuchsiad_exec:s0