drm/msm/sde: reprogram UIDLE after idle power-collapse

Reprogram the micro-idle registers while coming out
of idle power-collapse as the registers would have
been reset during power-collapse.

Change-Id: Ib6d385eae7b4873f1e5f13715b5bf512285b7abb
Signed-off-by: Veera Sundaram Sankaran <veeras@codeaurora.org>