drm/i915/irq: remove GEN3_IRQ_RESET() and GEN3_IRQ_INIT() macros

drm/i915/irq: remove GEN3_IRQ_RESET() and GEN3_IRQ_INIT() macros

Define register offset triplets for all registers used with
GEN3_IRQ_RESET() and GEN3_IRQ_INIT() 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/20241002102645.136155-2-jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>