hal: add GD32F4xx series HAL version 2.1.0 #7
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Add the HAL for GD32F4xx series. HAL version is 2.1.0 (taken from the
2.1.3 package). This HAL can be used for GD32F405/407/450.
Origin: http://www.gd32mcu.com/download/down/document_id/247/path_type/1
Note: requires CMake changes/Kconfig options on the Zephyr side, waiting for initial HAL import to be merged.