debuggerd_test: provide stub selinux/android.h

debuggerd_test stubs out the selinux/android.h interface, but was
relying on copied selinux headers to declare the interface.  Create a
stub selinux/android.h header included by the test to declare the
interface.

Change-Id: I6a2d402dda1797deb2515f10b663b1a84d498eac
1 file changed