mlxsw: Make pci module dependent on HAS_DMA and HAS_IOMEM

This resolves compile errors on um-allyesconfig.

Note that there are many other drivers which have the same issue.

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>