hid: Import hidraw(4) - driver for access to raw HID device data

This driver provides raw access to HID devices through uhid(4)-compatible
interface and is based on pre-8.x uhid(4) code. Unlike uhid(4) it does
not take devices in to monopoly ownership and allows parallel access
from other drivers.

hidraw supports Linux's hidraw-compatible interface as well.

Reviewed by: hselasky
Differential revision: https://reviews.freebsd.org/D27992