tests/tcg: target/mips: Remove an unnecessary file

Remove a file that was added long time ago by mistake. The commit
that introduced this file was commit d70080c4 (from 2012).
Reviewed-by: NAleksandar Rikalo <arikalo@wavecomp.com>
Acked-by: NAlex Bennée <alex.bennee@linaro.org>
Reviewed-by: NEric Blake <eblake@redhat.com>
Signed-off-by: NAleksandar Markovic <amarkovic@wavecomp.com>

tests/tcg/mips/mips64-dspr2/.directory

-[Dolphin]
-Timestamp=2012,8,3,16,41,52