Initial step in deprecating previous dual arf code.

Always use cpi->multi_layer_arf branch if enable_auto_arf >= 2.

Use enable_auto_arf value to indicate max number of ARF
levels to use in multi-arf case.

Further cleanup to of old code follow in seperate patches.

Change-Id: I25cd1e4a119a2d482a15705f5126389054764f9f
2 files changed