adb: Add io size and zero packet to usb_handle

Fastboot protocol doesn't include zero packets,
so make it possible to configure that.

Allow fastbootd to see how many bytes the handle
can read/write at once.

Test: adb works
Bug: 78793464
Change-Id: I31e444f384d9d0cdf1ea936439b2028f8151c3b8
2 files changed