msm: display: Clear performance request data in turning on

In resume, previous cached request data needs be cleared as
they do not reflect the current hw status.

Signed-off-by: Ken Zhang <kenz@codeaurora.org>

Conflicts:

	drivers/video/msm/mdp4_overlay.c

Change-Id: I6e3abe09a38b4499ceb168ea7b0351672253a6cd
Signed-off-by: Ramakrishna Prasad N <crpn@codeaurora.org>