bnxt_en: Modify RX ring indexing logic.

Modify the RX indexing logic for both RX ring and RX aggregation ring just
like the TX logic.  Change it so that the index increments unbounded and
mask it only when needed.

Modify the existing RX macros so that the index is not masked.  Add new
macros RING_RX()/RING_RX_AGG() to mask it only when needed to get the
index of rxr->rx_buf_ring[] and rxr->rx_agg_ring[].

Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Link: https://lore.kernel.org/r/20231120234405.194542-12-michael.chan@broadcom.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>