disp: msm: sde: fix trusted-ui transition checks

Avoid crtc_state active_changed flag and explicitly check new/old
crtc_state active to decide if trusted vm transition checks are
required. As the active_changed might not be set at this point
in atomic_check sequence.

Change-Id: I142befad68359ae5ee862a1306bdc75531d63e70
Signed-off-by: Veera Sundaram Sankaran <veeras@codeaurora.org>