Add "Peripherals configuration" menu for STM32F4 with U[S]ARTs
Add "Peripherals configuration" menu for STM32F4 with U[S]ARTs

Adds following options:
- CHIP_USART1_ENABLE
- CHIP_USART2_ENABLE
- CHIP_USART3_ENABLE
- CHIP_UART4_ENABLE
- CHIP_UART5_ENABLE
- CHIP_USART6_ENABLE
- CHIP_UART7_ENABLE
- CHIP_UART8_ENABLE
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