Revert "drm/msm/mdp5: Ensure clocks are enabled in legacy cursor disable path"

This reverts commit 91eecf30.

This will be replaced by the commit headed upstream:
"drm/msm/mdp5: fix unclocked register access in _cursor_set()"

Signed-off-by: Archit Taneja <architt@codeaurora.org>