Gfx-Display: correct the reg setting of MIPI in driver

Gfx-Display: correct the reg setting of MIPI in driver

BZ: 29163

This is a supplement to patch 40888 which correct the MIPI reg 0x61190 setting.
The former patch just correct the setting for Video mode; this patch clean the
code for MIPI command mode.

Change-Id: I41f32409cbdaf9131461cc409b06e7b5bac6e8e4
Signed-off-by: Lei Zhang <lei.zhang@intel.com>
Reviewed-on: http://android.intel.com:8080/47144
Reviewed-by: Ai, Ke <ke.ai@intel.com>
Reviewed-by: Patel, Hitesh K <hitesh.k.patel@intel.com>
Reviewed-by: Tong, BoX <box.tong@intel.com>
Tested-by: Tong, BoX <box.tong@intel.com>
Reviewed-by: Lu, Faxing <faxing.lu@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>