The speed feature sf->lpf_picl == LPF_PICK_MINIMAL_LPF is used
to disable loop filtering. This did not work with the loop-restoration
experiment, but now it is respected.

Note that this speed feature is only used in real-time cpu-used >= 8
settings.

Change-Id: I193723c9ac5f802ec31d8c8b4d37650796e065fd