[DISC_F407VG & ARCH_MAX] change default toolchain
[HAL][ARCH_MAX] use different PeripheralNames.h for STDIO_UART
Merge pull request #537 from xiongyihui/stm32f407

HAL: DISC_F407VG, ARCH_MAX - change default toolchain

- ARCH_MAX - use different PeriheralNames.h files