Revert "msm_fb: mdss: register mdss devices for system shutdown"

This reverts commit a097c1e761fca6eedee1554dc0c068880716d824

Original patch was vulnerable to race condition of system restart task
and other task opening frame buffer devices. This race condition was
introduced because kernel framework of device shutdown adds a fake
ref-count to pm_runtime of the device. This fake ref-count causes
unexpected regressions when device is opened after it was shutdown.
Reverting original patch until proper fix is identified.

CRs-Fixed: 515199
Change-Id: I14324f9875e960a922c5b2b773b086c79a82b09a
Signed-off-by: Shashank Babu Chinta Venkata <sbchin@codeaurora.org>
Signed-off-by: Tirtha Kanti Ghosh <tirtha@codeaurora.org>
Signed-off-by: Ujwal Patel <ujwalp@codeaurora.org>