Backend: Refine return value of sub_group_all/any to 1
Backend: Refine return value of sub_group_all/any to 1

The old sub_group_all/any will return 65535 as true. Refine them to 1.
V2: Remove unused value.

Signed-off-by: Pan Xiuli <e5a665b1e626c5dc0826076a8b5a209eb48bf6ee@intel.com>
Reviewed-by: Yang Rong <78759e37dc7114caed18f74e7515c5cb519dbf6d@intel.com>

wdv4758h/beignet,wdv4758h/beignet,wdv4758h/beignet,wdv4758h/beignet,wdv4758h/beignet