Rename genericSTM32H750VBT6.json to genericSTM32H750VB.json

Simplify board ID

Author: valeros

boards/genericSTM32H750VBT6.json renamed to boards/genericSTM32H750VB.json

@@ -34,4 +34,4 @@
   },
   "url": "https://www.st.com/en/microcontrollers-microprocessors/stm32h750vb.html",
   "vendor": "Generic"
-}
+}