bnxt_en: Check RSS contexts in bnxt_need_reserve_rings()

bnxt_en: Check RSS contexts in bnxt_need_reserve_rings()

bnxt_need_reserve_rings() checks all resources except HW RSS contexts
to determine if a new reservation is required.  For completeness, add
the check for HW RSS contexts.  This makes the code more complete after
the recent commit to increase the number of RSS contexts for a larger
RSS indirection table:

Fixes: 51b9d3f948b8 ("bnxt_en: Use a larger RSS indirection table on P5_PLUS chips")
Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Reviewed-by: Joe Damato <joe@dama.to>
Link: https://patch.msgid.link/20260207235118.1987301-3-michael.chan@broadcom.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>