msm: mdp: Disable early suspend only for the MDP driver

Early suspend is deprecated in the framework but disabling it
completely can affect other subsystems. Disabling only for the
MDP driver.

Change-Id: I030a52dd569c6f7abb7437677cd1deb7a07093bf
Signed-off-by: Naseer Ahmed <naseer@codeaurora.org>