bnxt_en: do not map packet buffers twice

[ Upstream commit 23c93c3b ]

Remove double-mapping of DMA buffers as it can prevent page pool entries
from being freed.  Mapping is managed by page pool infrastructure and
was previously managed by the driver in __bnxt_alloc_rx_page before
allowing the page pool infrastructure to manage it.

Fixes: 578fcfd2

 ("bnxt_en: Let the page pool manage the DMA mapping")
Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>
Signed-off-by: Andy Gospodarek <andrew.gospodarek@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Reviewed-by: David Wei <dw@davidwei.uk>
Link: https://lore.kernel.org/r/20231214213138.98095-1-michael.chan@broadcom.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>