driver: usb_dc_sam_usbhs: Actually set detach bit
driver: usb_dc_sam_usbhs: Actually set detach bit

Device physically detaches when the DETACH bit is set. Fix the
assignment to actually set the bit instead of clearing it.

Signed-off-by: Tomasz Moń <f44a0a0857de22882044c93edbe6b590cb840e13@nordicsemi.no>

finikorg/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,finikorg/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,galak/zephyr,galak/zephyr