ARM: dts: msm: Enable labibb regulator for msm8917

Enable labibb regulator for pmi8950 and pmi8940 used
in msm8917 CDP and MTP. Register display DSI module
as a consumer of this regulator.

Change-Id: I3a0ccc5a718c5af3482ab80e7dd00b601bd989e3
Signed-off-by: Nirmal Abraham <nabrah@codeaurora.org>