Introduce GD32F4xx serial SoCs with GD32F450i_EVAL board#39909

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cameled wants to merge 4 commits intozephyrproject-rtos:mainfrom

BrainCoTech:gd32f450

Commits on Oct 29, 2021

modules: add gd32f4xx library to gigadevice hal
cameled
committed

Commits on Oct 31, 2021