drm/i915/cursor: Program secondary cursor planes

Iterate over all joined pipes when arming/disabling the cursor plane so
secondary pipes are updated together with the primary. The pin, check
and state duplication for secondary pipes was already prepared in the
previous commit; this converts the update_arm pass to a loop over the
joined_pipe_state[] array.

Because the whole loop runs inside a single primary vblank-evade,
sample intel_crtc_get_vblank_counter() per pipe around each arm and
emit a drm_err() if the counter ticks during that pipe's own
programming.

v2: Check primary and secondary pipe together. [Ville]
v3: Use struct intel_cursor_joiner_state. [Ville]
v4: Add per-pipe vblank straddle detection around the arm loop. [Chaitanya]
v5: Move straddle check outside the loop to cover all pipes together.
    Sample vblank counter from primary pipe only.
    Move drm_err() after local_irq_enable(). [Chaitanya]

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/20260901072813.2596383-5-nemesa.garg@intel.com

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