drm/i915/cmtg: Add intel_cmtg_is_allowed() for CMTG

CMTG is supported on transcoder A and transcoder B with EDP,
so add a separate helper intel_cmtg_is_allowed() to check the
prerequisites for enabling CMTG. CMTG will be enabled only in
specific use cases such as PSR2, PR-ALPM, and LOBF, and will be
used in conjunction with the DC3CO feature. DC3co will be enabled
in a separate patch.

Note: Use-case-specific checks and transcoder-port compatibility
validation will be handled part of DC3co feature implementation.

v2:
- Remove separate flag for DC3co from crtc_state. [Uma, Dibin]

v3:
- Do not access power domain members directly. [Jani]

v4:
- Remove check for DC3co state now. if needed add Dc3co allow check
later once Dc3co patches are merged. [Uma]

Bspec: 68915
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Reviewed-by: Dibin Moolakadan Subrahmanian <dibin.moolakadan.subrahmanian@intel.com>
Signed-off-by: Animesh Manna <animesh.manna@intel.com>
Link: https://patch.msgid.link/20260615200339.885190-2-animesh.manna@intel.com

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