drm/komeda: remove slave_planes property

Properties are uapi like anything else, with all the usual rules
regarding review, testcases, open source userspace ... Furthermore
driver-private kms properties are highly discouraged, over the past
few years we've realized we need to make a serious effort at better
standardizing this stuff.

Again this probably needs multiple pieces to solve this properly:

- To make plane configuration less surprising to userspace you
  propably need to virtualize planes, and reorder which logical plane
  you map to which physical one dynamically. Instead of exposing a
  komeda-specific limitation to userspace and expecting them to dtrt.
  I think msm and rcar-du do that already (and others), if you need
  people to chat with or example code.

- If this is needed for validation, again ->atomic_print_state and the
  infrastructure around that is your friend.

Fixes: 3b9dfa4ef28c ("drm/komeda: Add slave pipeline support")
Cc: Lowry Li (Arm Technology China) <[email protected]>
Cc: James Qian Wang (Arm Technology China) <[email protected]>
Cc: Liviu Dudau <[email protected]>
Cc: Mali DP Maintainers <[email protected]>
Cc: Brian Starkey <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Signed-off-by: Liviu Dudau <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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