Update code for ArteryTek AT32F405, AT32F415 and added support for AT32F402

[HorrorTroll]

Changelog:

• Update CMSIS for AT32F402, AT32F405 and AT32F415.
• Update linker, startup, cmparams for AT32F405 and AT32F415. Added for AT32F402.
• Update board files for AT32F405 and AT32F415. Added for AT32F402.
• Update platform files for AT32F405 and AT32F415. Added for AT32F402.
• Move USART ISR to USART folder.
• Update TMR ISR for AT32F402, AT32F405 and AT32F415.

LLD Drivers:

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Peripheral	Status
ADCv1	Updated
ADCv2	Updated
CRC	Updated
DMAv1	Updated
DMAv2	Updated
EXINT	Updated
GPIOv1	Updated
GPIOv2	Updated
I2Cv1	Updated
I2Cv2	Updated
OTG	Updated
RTC	Updated
SDIO	Updated
SPIv1	Updated
SPIv2	Updated
SYSTICK	Updated
GPT on TMR	Updated
ICU on TMR	Updated
PWM on TMR	Updated
Serial on USARTv1	Updated
UART on USARTv1	Updated
Serial on USARTv2	Updated
SIO on USARTv2	Added
UART on USARTv2	Updated
WDT	Updated

Demo boards:

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Board	Status
RT-AT-START-F402	Added
RT-AT-START-F405	Updated
RT-AT-START-F415	Updated

Test HAL:

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Driver	AT32F402	AT32F405	AT32F415
ERTC	Added	Added	Updated
I2C_HW	Added	Added	Updated
I2C_SW	Added	Added	Updated
PWM_ICU	Added	Added	Updated
SDC	✖️	✖️	Updated
SDC-FATFS	✖️	✖️	Updated
SIO	Added	Added	✖️
UART	Added	Added	Updated
USB_CDC	Added	Added	Updated
WDT	Added	Added	Updated