Firmware version 161212BD0709 adds TRIM support to SDOCK2U313R

To install:
1. Insert a drive into either slot of SDOCK2U313R
2. Connect SDOCK2U313R to a computer running Windows over USB
3. Power on SDOCK2U313R
4. Extract the contents of "sdock2u313r_firmware.zip"
4. Right click on SSI_135xFWUpg3014_161212BD0709_V1.exe from the extracted location, and select "Run as adminsitrator"