msm:vidc: provide support to raise afab and ebi1 clks to turbo mode.

This change provides support to raise the clks to turbo mode for mpeg4
clips with high number of slices. The firmware performance degrades if
the number of slices is more than 10. Without this fix, we see lot of
frame drops happening, causing a freeze effect.

Change-Id: Ia897854ef6d30bb97cd37810b22eb1ab5ad818fb
CRs-Fixed: 358615
Signed-off-by: Arun Menon <menon@codeaurora.org>