MIPS: kernel: traps: Fix broken indentation

Fix broken indentation caused by the SMTC removal
commit b633648c
("MIPS: MT: Remove SMTC support")
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Fixes: b633648c ("MIPS: MT: Remove SMTC support")
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/10581/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>