usb: re-enable EHCI, share HID keyboard decoding, fix boot protocol

- ehci: DEBUG_MATRIX was left true in be868a4, so every boot replaced
  enumeration with the one-shot diagnostic transfer matrix and returned
  false -- the EHCI driver never brought a device up.  Default it off;
  flip it back on only when bisecting a controller fault.
- new rsnix/src/hid.rs: boot-keyboard HID usage -> scancode-set-1
  tables, the shared scancode FIFO, and a per-device report differ.
  UHCI now uses it instead of its own copy, so EHCI/xHCI keyboards can
  feed the same PS/2 decoder (`ps2::feed_scancode`).
- uhci: SET_PROTOCOL now asks for the boot protocol (wValue 0) instead
  of report protocol (wValue 1).  In report protocol the report layout
  is device-defined, but every driver parses boot reports.

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