Build control_files package for Brillo builds.

control_files package contains all the test control files in autotest.
Ideally, each board should set a variable to include the test control
files only matter to the bard in BoardConfig.
This change builds a default package including all control files.

Bug: 26971750
TEST=local build

Change-Id: I4be7a2881c54e1d66f43aa545327d769b5e25526
1 file changed