drm/i915/irq: remove GEN8_IRQ_RESET_NDX() and GEN8_IRQ_INIT_NDX() macros

drm/i915/irq: remove GEN8_IRQ_RESET_NDX() and GEN8_IRQ_INIT_NDX() macros

Define register offset triplets for all registers used with
GEN8_IRQ_RESET_NDX() and GEN8_IRQ_INIT_NDX() macros, and call the
underlying gen3_irq_reset() and gen3_irq_init() functions
directly. Remove the macros, along with the macro name concatenation
hackery.

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241002102645.136155-3-jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>