MIPS: RM7000: Double locking bug in rm7k_tc_disable()

We obviously intended to enable IRQs again at the end.

Fixes: 745aef5d ('MIPS: RM7000: Add support for tertiary cache')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Cc: kernel-janitors@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/13815/


Signed-off-by: Ralf Baechle <ralf@linux-mips.org>