MIPS: Lasat: Use setup_timer() helper

Use setup_timer function instead of initializing timer with the function
and data fields.

Signed-off-by: Allen Pais <allen.lkml@gmail.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/17341/


Signed-off-by: James Hogan <jhogan@kernel.org>