Fix regression after r364379.

The AMD's Ryzen 3 3200g XHCI controllers apparently need the evaluate
control endpoint context command, but we don't need to issue this
command when the bMaxPacketSize is received after the read of the USB
device descriptor, because this part should be handled automatically.

PR: 248784
Tested by: emaste, hselasky
MFC after: 1 week
Sponsored by: Mellanox Technologies