disp: msm: sde rotator driver configs for probe only

Added code for dummy probe defined under
CONFIG_SDE_ROTATOR_INIT_ONLY to address cases where
rotator device node is defined but driver needs to be
disabled. This is stop gap arrangement until v4l2
configs are available in GKI.

Change-Id: I069b37f818d2e4401b3992f1f1e308858a7e29e6
Signed-off-by: Raviteja Tamatam <travitej@codeaurora.org>