lib/intel_batchbuffer: Extend __intel_bb_create to handle context config

Currently, intel_bb stores context id with no information about the context
itself. This means that intel batchbuffer can only execute on a fixed set
of engines with pre-defined indices (so called legacy mode). To accommodate
contexts with custom engine layouts, save the context configuration in
intel_bb struct.

Update function calls to reflect that change.

Signed-off-by: Karolina Drobnik <karolina.drobnik@intel.com>
Reviewed-by: Zbigniew Kempczynski <zbigniew.kempczynski@intel.com>