drm/i915/cursor: Handle secondary cursor state

In joiner mode the fast path cursor update must handle
secondary pipes. Iterate over all joined pipes uniformly
to duplicate plane state, run check_plane(), pin the
framebuffer and on success swap in the new plane state
for each secondary cursor.

Track every successfully prepared pipe in a joined_pipe_state[] array
of struct intel_cursor_joiner_state so that later frontbuffer, unpin
and error-cleanup paths treat primary and secondaries uniformly,
and ensures the primary's pinned framebuffer is released if a
secondary fails partway through.

Convert the primary-only vblank unpin block into a loop over the
joined_pipe_state[] array so each pipe's old cursor framebuffer is
scheduled for unpin (or unpinned inline when unchanged) independently.
All unpin work is armed on the primary crtc's vblank (&crtc->base),
consistent with the single primary vblank evasion used above.

v2: Use intel_crtc_joined_pipe_mask(). [Ville]
    Add locking mechanism. [Ville]
v3: Drop the per-pipe fastpath mutex array. [sashiko]
v4: Fold parallel arrays into struct intel_cursor_joiner_state
    joined_pipe_state[]. Unify primary/secondary in a single loop.
    Use bare check_plane(). [Chaitanya]
v5: Fix secondary uapi.crtc to each pipe's own crtc.
    Rename intel_cursor_pipe to intel_cursor_joiner_state and
    joined[] to joined_pipe_state[]. [Chaitanya]
v6: Mirror primary uapi into secondary hw state, don't set uapi.crtc.
    [sashiko]
v7: Squash the per-pipe cursor unpin scheduling into this patch.[Chaitanya]
v8: Resolve checkpatch errors.

Assisted-by: Claude:claude-sonnet-4.6
Signed-off-by: Nemesa Garg <nemesa.garg@intel.com>
Reviewed-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Link: https://patch.msgid.link/20260901072813.2596383-4-nemesa.garg@intel.com

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