Split up ahci_port_portreset into a few smaller bits, and also slightly

adjust port multiplier detection so it doesn't call ahci_port_portreset
again directly, but instead restarts the loop for the current call.

During attach, poll for device detection across all ports until either all
ports have detected a device, or one second has passed, rather than doing
them sequentially.  Devices are still attached in order of port number,
so disk unit numbers won't change.

ok visa@

0 files changed, 0 insertions, 0 deletions