msm: mdss: fix dead lock between kickof and footswitch ctrl

There is a possibibility of dead lock due to below flow.
mdp3_ctrl.c:mdp3_ctrl_display_commit_kickoff
mutex_lock(&mdp3_res->fs_idle_pc_lock);
mdp3_ctrl.c:mdp3_ctrl_reset
mdp3.c:mdp3_clk_enable
pm_runtime_get_sync
mdp3.c:mdp3_runtime_resume
mdp3.c:mdp3_footswitch_ctrl
mutex_lock(&mdp3_res->fs_idle_pc_lock);

Change-Id: I059053767fe902570c1a448538adb18a2d921c9a
Signed-off-by: Raghavendra Ambadas <rambad@codeaurora.org>