cm-t35: fix incorrect BOARD_REV_SIZE value

Non-legacy layouts have an extended revision field,
but only the first 2 bytes are the PCB revision.

Signed-off-by: Nikita Kiryanov <nikita@compulab.co.il>
Signed-off-by: Igor Grinberg <grinberg@compulab.co.il>
1 file changed