drm/amd/display: Don't treat wb connector as physical in create_validate_stream_for_sink

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UBUNTU-CVE-2025-38098

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Don't treat wb connector as physical in createvalidatestreamforsink Don't try to operate on a drmwbconnector as an amdgpudmconnector. While dereferencing aconnector-base will "work" it's wrong and might lead to...