Add new feature bits for the net device
Since the new feature bits are >= 32, add support for reading higher
than 32bit feature words from the virtio mmio interface.
From working with -Wpacked its clear that some of the virtio
structures are overly packed and result in bad codegen on particular
architectures such as riscv. Roll back from using packed but
statically assert that the sizes are correct for some future arch
where things naturally pack differently.
Almost nothing changes here except moving braces to the same line as the
function declaration. Everything else is largely whitespace changes and
a few dangling files with tab indents.
See scripts/codestyle
-Not optimized yet, but should be pretty complete. Tested against qemu.
-Add switches to qemu script to allow running with a tap interface.
-Enable minip by default on vexpress-a9 platform
