If we use the cookie-based interrupt API on sun4v, whe shouldn't put the

If we use the cookie-based interrupt API on sun4v, whe shouldn't put the
interrupts in the lookup table.  On machines like the Oracle T7-2 this
would make the code believe that there is interrupt sharing, but since
we bypass intr_list_handler() when using the cookie-based interrupt API,
we wouldn't properly acknowledge the interrupt.

This fixes the last remaining problem with interrupts on the Oracle T7-2.