msm: mdss: Validating data values before passing on as operand

mdss_mdp_dfps_update_params uses data as operand. Hence the values
are validated against their max values allowed to avoid any overflow
in this change.

Change-Id: I630b9390a18446cd461154e31e08642a8ff06ed8
Signed-off-by: Harsh Sahu <hsahu@codeaurora.org>