drm/msm/sde: writer the register in ad calibration

No effect when set Assertiveness in AD4 calibration tools.
The calibration parameters_027 and parameters_028 was
missing to write the 0xE0 register in AD HW.

Change-Id: Ibc63634e0a102c9bd766c6129a15519bf0ccbdb9
Signed-off-by: Qing Huang <huangq@codeaurora.org>
Signed-off-by: Yuchao Ma <yuchaom@codeaurora.org>