Revert "display: capability for CPU frequency based LCD freq scaling - credits to AndreiLux"

This reverts commit f93972d378ee397b94fc77ac3447e7c0710013d3.
Update drivers/video/samsung/lcdfreq.c from Update 15
s3cfb: i9300 update12

Change-Id: I64c1a5821adf9ca3c72dc7e38a542cae020179d9