msm: vidc: remove redundant freq calculations

Remove freq list, which is unused in current dcvs design.
Remove unused dcvs load, load_low, load_norm, load_high,
as current dcvs design only use min_freq and dcvs_flags.

Change-Id: Ifbf251a9506286f2f34eca6eeb1af79bd07c0f43
Signed-off-by: Qiwei Liu <qiweil@codeaurora.org>