The commit 98478e02fe removed the setting of the CFG_TUD_MAX_SPEED define to OPT_MODE_DEFAULT_SPEED. This setting is usually not required since CFG_TUD_MAX_SPEED is determined from CFG_TUSB_RHPORT{0,1}_MODE. However, this does not work for STM32F429I-DISC1 where the HS port is used via the internal FS-PHY. Therefore the default speed setting is added again.
`CFG_TUD_MAX_SPEED` definition isn't required since tinyUSB derives it from `TUD_RHPORT_MODE` if not defined or uses the maximum speed the MCU supports by default.
