tests/kms_universal_plane: skip when pipe and primary plane cannot be off

amdgpu rejects when crtc is on + primary plane is off. As a result,
skipping these scenario when they cannot be turned off together, i.e.
crtc cannot be off when reading crc values.

Signed-off-by: Alex Hung <alex.hung@amd.com>
Reviewed-by: Mark Yacoub <markyacoub@chromium.org>