MIPS: ralink: remove deprecated IRQF_DISABLED

Remove the use of the IRQF_DISABLED flag
from arch/mips/ralink/timer.c

It's a NOOP since 2.6.35 and it will be removed soon.

Signed-off-by: Michael Opdenacker <michael.opdenacker@free-electrons.com>
Cc: akpm@linux-foundation.org
Cc: jkosina@suse.cz
Cc: standby24x7@gmail.com
Cc: rdunlap@infradead.org
Cc: yongjun_wei@trendmicro.com.cn
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/7886/


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