msm: vidc: remove turbo power mode

This seems like useless functionality. The governor
should calculate a proper frequency for the currently video
decode / encode settings.

Signed-off-by: Volodymyr Zhdanov <wight554@gmail.com>
[dereference23: Remove unused labels]
Signed-off-by: Alexander Winkowski <dereference23@outlook.com>
Change-Id: I3df139984034f2f17b6b63bee300a50be5ce88c9