drm/msm/dp: increase connect/disconnect notification timeout

Increase the connect/disconnect notification timeout from 2 seconds
to 5 seconds in order to account for processing delays in the
user mode stack.

CRs-Fixed: 2116863
Change-Id: I5cb97c98471fac4d42f590e5642fe0a34e238b00
Signed-off-by: Tatenda Chipeperekwa <tatendac@codeaurora.org>