Revert "drm/msm/dpu: add support for clk and bw scaling for display"

This is causing multiple armv7 missing do_div() errors, so lets drop it
for now.

This reverts commit 04d9044f.

Cc: Kalyan Thota <kalyan_t@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>