Revert "mdss_dsi_panel.c: add powersuspend hooks"

This reverts commit c6823550cfb7d617a031f1367a75a44bebbd4944.
Revert "kernel/power/powersuspend: LCD screen on/off hooks (Yank555.lu)"

This reverts commit 6cfa3dc6a66610be18368d6818352f412488eff4.
Revert "kernel/power/powersuspend: default to userspace for now"

This reverts commit 58b3e0c2a0a5087a8cb432fa29c94ae20ac71fcb.