bnxt: hook NAPIs to page pools

bnxt has 1:1 mapping of page pools and NAPIs, so it's safe
to hoook them up together.

Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Tested-by: Dragos Tatulea <dtatulea@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>