Add first_spatial_layer_to_encode to SVC.
Use the existing VP9_SET_SVC control to set the first spatial layer to encode. Since we loop over all spatial layers inside the encoder, the setting of spatial_layer_id via VP9_SET_SVC has no relevance. Use it instead to set the first_spatial_layer_to_encode, which allows an application to skip encoding lower layer(s). Change only affects the 1 pass CBR SVC. Change-Id: I5d63ab713c3e250fdf42c637f38d5ec8f60cd1fb
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