bnxt_en: Refactor RSS capability fields

Add a new rss_cap field in the per device struct bnxt and move all
the RSS capability fields there.  It will be easier to add new RSS
capabilities for the new P7 chips.

Signed-off-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Link: https://lore.kernel.org/r/20231201223924.26955-7-michael.chan@broadcom.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>