Revert "olympus: increase refresh_rate to 66"

This reverts commit e18d459f6a0764e3af43378bc850cc9af507baad.
olympus-panel: reduce h-porch and pclk

Appears to be working good.

Change-Id: I71a9751b7739e1a2c92a656eadbf38b2fab35a6e
Merge branch 'ics' into martincz