bnxt_en: Implement XDP RSS hash metadata extraction for V3_CMP

bnxt_en: Implement XDP RSS hash metadata extraction for V3_CMP

This adds another conditional when cmp_type is CMP_TYPE_RX_L2_V3_CMP for
drivers that support this completion format.

This re-uses bnxt_rss_ext_op to provide similar functionality. One
limitation is for L4 hash-types, protocol-specific bits can't be
determined.

Reviewed-by: Joe Damato <joe@dama.to>
Signed-off-by: Chris J Arges <carges@cloudflare.com>
Link: https://patch.msgid.link/20260325201139.2501937-5-carges@cloudflare.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>