bnxt_en: Refactor and refine bnxt_tpa_start() and bnxt_tpa_end().

bnxt_en: Refactor and refine bnxt_tpa_start() and bnxt_tpa_end().

Refactor bnxt_tpa_start() by adding bnxt_tpa_metadata() to gather the
metadata from the TPA_START completion.  This makes it easier to
support the new P7 chip which has a modified TPA_START completion
structure with different metadata formats.  We also add vlan_valid
and cfa_code_valid fields to the bnxt_tpa_info structure so that the
VLAN and VF rep logic can be common for all chips.  The VLAN metadata
is now collected in bnxt_tpa_start() only when it is valid and the
vlan_valid field will be set.  bnxt_tpa_end() can now use common VLAN
logic for all chips.

Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Link: https://lore.kernel.org/r/20231201223924.26955-10-michael.chan@broadcom.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>