Revert "s3cfb: Notify userspace of vsync using sysfs, make uevents optional"

This reverts commit f70fd7bf32d2f55c46432a0662ea3fc140121d07.
Revert "Temasek defconfig - enable sysfs vsync notifications"

This reverts commit c4260857ceed66cc1849d26338026947c7e885c0.