net: aquantia: Detach SMMU during PCI device removal

Enable support for performing SMMU detach during PCI device removal
that is required for converting the driver to a loadable module.

Change-Id: Id5361db7607fa647308ba1eaaa5159cbc0add272
Signed-off-by: Jinesh K. Jayakumar <jineshk@codeaurora.org>