soc: arm: gigadevice: gd32f4xx: select AF pinmux

GD32F4XX series have AF based pinmux.

Signed-off-by: Gerard Marull-Paretas <[email protected]>

Author: gmarull

soc/arm/gigadevice/gd32f4xx/Kconfig.series

@@ -8,5 +8,6 @@ config SOC_SERIES_GD32F4XX
 	select CPU_HAS_FPU
 	select CPU_CORTEX_M4
 	select SOC_FAMILY_GD32_ARM
+	select GD32_HAS_AF_PINMUX
 	help
 	  Enable support for GigaDevice GD32F4XX MCU series