[2.0.x] Add GTM32 Pro VB support (#10898)

Marlin/src/pins/pins.h

@@ -362,6 +362,8 @@
   #include "pins_MALYAN_M200.h"       // STM32F1                                    env:malyanm200
 #elif MB(CHITU3D)
   #include "pins_CHITU3D.h"           // STM32F1                                    env:STM32F1
+#elif MB(GTM32_PRO_VB)
+  #include "pins_GTM32_PRO_VB.h"      // STM32F1                                    env:STM32F1
 
 //
 // STM32 ARM Cortex-M4F