libeffects: Fix LVDBE biquad instance creation

LVDBE HPF biquad was created everytime LVDBE_Control was
called, but LVDBE_SetFilters was called only when there
was a change in parameters.

biquad creation is now done only when number of channels
changes and SetFilters is called for change in number of
channels as well.

Bug: 179462586
Test: lvm/tests/build_and_run_all_unit_tests.sh
Change-Id: I2edd4e02de28a36b3fb455cec6d6e63f16dbcc9f