disp: msm: sde: add allow_gdsc_toggle property for scuba target

During crtc_disable, gdsc toggle will not happen if an
external vote(like secure vote) is present. In such cases,
this change allows gdsc to toggle by removing the vote
temporarily and adding it again.

Change-Id: Ib3a745d75bba460ba3563940770726347786348a
Signed-off-by: Yashwanth <yvulapu@codeaurora.org>