decreased design_note field from 52B to 48B to fit the 32 word system

...ries/unb2b_board/src/vhdl/unb2b_board_system_info_reg.vhd

...board2b/libraries/unb2b_board/unb2b_board.peripheral.yaml

...ries/unb2c_board/src/vhdl/unb2c_board_system_info_reg.vhd

...board2c/libraries/unb2c_board/unb2c_board.peripheral.yaml