pinctrl: msm: Correct function group for mdp_vsync_out_*

Correct function group for mdp_vsync_out_0 and mdp_vsync_out_1
in bengal platform. It has happened due to same two words of the
config name in the same gpio.

Change-Id: I8d7beaae9945f6cde9408c2f8c9005b20c3533d6
Signed-off-by: Shadab Naseem <snaseem@codeaurora.org>