msm: mdss: dp: fix event queue management

Current implementation utilizes a simple event queue to handle
some of the tasks when setting up or tearing down a display port
session. This is currently achieved using a workqueue and assumes
that there can be at most one unhandled event outstanding. This
may not be valid and can result certain events being skipped.
Refactor this by handling the events in a new event thread.

CRs-Fixed: 1109812
Change-Id: I2041fd2bbeadbfc7726a6c504ec3e373f34d2aea
Signed-off-by: Aravind Venkateswaran <aravindh@codeaurora.org>

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