drm/i915/cmtg: Add CMTG interrupt handling

Add support for the CMTG vblank interrupt, which is delivered
through the DE port interrupt block. Enable/disable the interrupt
via the DE port IMR around CMTG enable/disable, and dispatch the
CMTG_VBLANK_{A,B} bits to the corresponding pipe vblank handler in
the gen8 DE IRQ handler.

Wired up for DISPLAY_VER 35. The CMTG interrupt is not enabled via
IER today because CMTG is brought up together with the eDP
transcoder; this can be revisited later.

v2:
- Use consistent DC3co check as used in earlier patches. [Uma]
- Use else-if instead of separate if block. [Uma]
- Merge mask and unmask function as it is similar. [Uma]
- Modify DISPLAY_VER() check. [Uma]

v3:
- Enable only vblank interrupt. [Dibin]

v4:
- Keep irq related code to intel_display_irq.c. [Jani, Uma]

Signed-off-by: Animesh Manna <animesh.manna@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Link: https://patch.msgid.link/20260615200339.885190-23-animesh.manna@intel.com

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