ozone/drm: Add helper to generate all permutations of CRTC/Connector pairings

The kernel sometimes uses multiple CRTCs for a single connector without
marking the CRTC as in use to userspace. One such case is when
Bigjoiner (an intel driver feature) takes an additional CRTC for high
bandwidth modes. Modesetting with a stolen CRTC will result in failure.
The only way to work around additional CRTCs being taken is to test
modeset on various CRTC-connector permutations, and to use the
permutation that doesn’t fail.

To facilitate test modeset with all possible permutations of
CRTC-connector pairings, this CL introduces
GetAllCrtcConnectorPermutations(), which takes in a list of connectors
and returns a list of all possible CRTC-connector pairing permutations.
The returned list will only return permutations where all specified
connectors are assigned to a CRTC.

Bug: b:322831691
Test: ozone_unittests
Change-Id: I9651fa764c9c8a980493696c0e0bf0443dab2b81
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5301490
Reviewed-by: Gil Dekel <gildekel@chromium.org>
Reviewed-by: Mark PMNKHME <markyacoub@google.com>
Commit-Queue: Su Hong Koo <sukoo@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1272969}