Support all other GD32 ARM chips

[maxgerhardt]

This repo adds support for the GD32 series

• GD32E23x (Cortex-M23) via gd32e23x.cfg
• GD32VF103 (RISC-V) via gd32vf103.cfg

however, there is no dedicdated support for all the other GD32 ARM chip series

• GD32E10x (Cortex-M4)
• GD32E50x (Cortex-M33)
• GD32F10x (Cortex-M4)
• GD32F1x0 (Cortex-M3)
• GD32F20x (Cortex-M3)
• GD32F30x (Cortex-M4)
• GD32F3x0 (Cortex-M4)
• GD32F4xx (Cortex-M4)
• GD32F403 (Cortex-M4)

For some of these series, it works to specify a STM32 configuration file, by playing around & guessing (here). When using that approach, one still gets a few warnings though (e.g., flash size autodetected in a wrong way).

However, some of these series have no STM32 equivalent here, e.g. the E50x series (Cortex-M33). STM has the L5 series (here) that is Cortex-M33 based, but OpenOCD doesn't have a stm32l5x target.

We'd appreciate if there were clear OpenOCD configuration files for each GD32 ARM series chips, as that helps us develop open-source support for developing for GD32 series chips with PlatformIO and OpenOCD (https://github.com/CommunityGD32Cores/platform-gd32).

[maxgerhardt]

Support for GD32WLxx would also be greately appreciated.