mlx5en: bump MLX5E_MAX_BUSDMA_RX_SEGS

This is needed to accomodate more data segments in wqes for 64K receive
mbuf chains.

Reviewed by: Ariel Ehrenberg <aehrenberg@nvidia.com>, Slava Shwartsman <slavash@nvidia.com>
Sponsored by: NVidia networking
MFC after: 1 week