CTS test /dev/diag

Added a CTS test to check if /dev/diag is present on system, which it should not be.

(Cherrypicked from 095beb02096c4b3bbda388d7acf30cad86c8e5f0)

Change-Id: I928892d8e79a06be7f49366cfcb0591841a0d786
1 file changed