Only allow interp_filter change in SWITCHABLE mode

This commit added a logic to prevent the inter_filter type from being
changed if the default interp_filter mode is not switchable. Also, it
sets the default interp_filter to BILINEAR at very and super fast rtc
encoding modes

Change-Id: Ic41e6d31de29795a4ce536ec79afb01cab6daad3
2 files changed