sysfs: Adding sysfs_attr_init, needed for hw vsync patch

Change-Id: I778339a2bec645b9de33ba5001788946d7e4f115
Signed-off-by: RonGokhale <cips173@gmail.com>
msm_fb: vsync events for legacy MDP 3.00 targets

Pieced together from current code in CAF. This is very specific to
MDP 3.00 targets that use the LCDC display controller, and it might
break horribly and badly on anything else.

Change-Id: I2b7086a17fd22a04d61d7962f4ea98ab1af00442