bnxt_en: Add RX page mode support.

bnxt_en: Add RX page mode support.

Orabug: 25645429

This mode is to support XDP.  In this mode, each rx ring is configured
with page sized buffers for linear placement of each packet.  MTU will be
restricted to what the page sized buffers can support.

Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit c61fb99cae51958a9096d8540c8c05e74cfa7e59)
Signed-off-by: Brian Maly <brian.maly@oracle.com>
Conflicts:
	drivers/net/ethernet/broadcom/bnxt/bnxt.c