MIPS: Fix typo when reporting cache and ftlb errors for ImgTec cores

Introduced by the following two commits:
75b5b5e0
"MIPS: Add support for FTLBs"
6de20451
"MIPS: Add printing of ES bit for Imgtec cores when cache error occurs"

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Reported-by: Matheus Almeida <Matheus.Almeida@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Markos Chandras <markos.chandras@imgtec.com>
Cc: stable@vger.kernel.org # v3.14+
Patchwork: https://patchwork.linux-mips.org/patch/6980/


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