k2_fw_usb_api: fix typo in reg address

this was writing defenetly to wrong address.

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
k2_fw_usb_api: fix typo in usb reg address

we was writing to wrond register.
0x100ae = ep3
0x100af = ep4

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>