intel/fs/gen11+: Fix CS_OPCODE_CS_TERMINATE codegen.

intel/fs/gen11+: Fix CS_OPCODE_CS_TERMINATE codegen.

Apparently the ts_request_type and ts_resource_select thread spawner
message descriptor bits were removed from the hardware at least since
ICL.  Drop them in order to avoid assertion failures on Gen12+
platforms which don't have any encoding for this.  On Gen9+ these are
probably just ignored by the hardware, so this is unlikely to have had
any functional implications prior to Gen12.

v2: Mark TS message fields as non-existing in brw_inst.h on ICL. (Caio)

Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>