stm32f205_usart: Update USART to meet the 405 devices

Signed-off-by: Alistair Francis <alistair23@gmail.com>
stm32f205_syscfg: Update syscfg based on the 405

Signed-off-by: Alistair Francis <alistair23@gmail.com>
stm32f205_timer: Update timer based on the 405

Signed-off-by: Alistair Francis <alistair23@gmail.com>
stm32f205_soc: Update to match the other devices

Signed-off-by: Alistair Francis <alistair23@gmail.com>