msm_fb: display: no early suspend for writeback panel

Writeback panel is not real physical panel and no power consumption
concern, so it is removed from early suspend registration to avoid
open fb2 error during suspend/resume.

CRs-fixed: 371137
Signed-off-by: Huaibin Yang <huaibiny@codeaurora.org>
(cherry picked from commit efb6c143ea951dab6dc72586100999d5b94c1c8d)

Conflicts:

	drivers/video/msm/msm_fb.c

Change-Id: I004cd5f80bf200bb29b992b0fd445e3b7d2f1e35
Signed-off-by: Ramakrishna Prasad N <crpn@codeaurora.org>