libeffects: Add multichannel processing support

Multichannel processing support added for Bundled effects including

Bass Enhancement (DBE)
N Band Equalizer (EQNB)
Concert Surround / Stereo Widening (CS)
Parametric Spectrum Analysis (PSA)
DC removal
Treble Boost

Test: Solo Tester, CTS Effects Test, Local Native Test
Bug: 72223862
Change-Id: Ide86b529a7574c26306098fedd7b276b3688998f