drm/i915/icl: Use hw engine class, instance to find irq handler

Interrupt identity register we already read from hardware
contains engine class and instance fields. Leverage
these fields to find correct engine to handle the interrupt.

v3: rebase on top of rps intr
    use correct class / instance limits (Michel)
v4: split engine/other handling
v5: empty iir is not err (Daniele, Michel)

Suggested-by: Daniele Ceraolo Spurio <[email protected]>
Cc: Daniele Ceraolo Spurio <[email protected]>
Cc: Chris Wilson <[email protected]>
Cc: Tvrtko Ursulin <[email protected]>
Cc: Michel Thierry <[email protected]>
Signed-off-by: Mika Kuoppala <[email protected]>
Reviewed-by: Daniele Ceraolo Spurio <[email protected]>
Reviewed-by: Michel Thierry <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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