drm/i915/irq: Fix a "the the" typo

There is an unexpected word "the" in the file i915_irq.c,
fix it.

Signed-off-by: Bo Liu <liubo03@inspur.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220816094919.5419-1-liubo03@inspur.com