drm/i915: Enable pipeDMC fault interrupts on tgl+

PipeDMC has its own fault interrupt. Enable that so that
we can know if things are failing.

While at it, define the other pipeDMC interrupt as well, even
though we're not currently using it.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240605111832.21373-7-ville.syrjala@linux.intel.com


Reviewed-by: Jani Nikula <jani.nikula@intel.com>