Add GD32F10x to known datasheets #217

Job	Run time
build (ubuntu-latest, 3.7, examples/gd32-arduino-blinky)	1m 40s
build (ubuntu-latest, 3.7, examples/gd32-mbedos-baremetal-blinky)	2m 15s
build (ubuntu-latest, 3.7, examples/gd32-spl-blinky)	2m 0s
build (ubuntu-latest, 3.7, examples/gd32-w51x-wifi-scan)	52s
build (windows-latest, 3.7, examples/gd32-arduino-blinky)	2m 51s
build (windows-latest, 3.7, examples/gd32-mbedos-baremetal-blinky)	8m 55s
build (windows-latest, 3.7, examples/gd32-spl-blinky)	4m 28s
build (windows-latest, 3.7, examples/gd32-w51x-wifi-scan)	3m 39s
build (macos-latest, 3.7, examples/gd32-arduino-blinky)	2m 33s
build (macos-latest, 3.7, examples/gd32-mbedos-baremetal-blinky)	4m 8s
build (macos-latest, 3.7, examples/gd32-spl-blinky)	3m 31s
build (macos-latest, 3.7, examples/gd32-w51x-wifi-scan)	11m 2s
	47m 54s

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