remove ST's stm32f4xx_hal_driver submodule due to bug in qspi driver

Author: sgauche

.gitmodules

@@ -199,9 +199,6 @@
 [submodule "ports/stm/st_driver/cmsis_device_f4"]
 	path = ports/stm/st_driver/cmsis_device_f4
 	url = https://github.com/STMicroelectronics/cmsis_device_f4.git
-[submodule "ports/stm/st_driver/stm32f4xx_hal_driver"]
-	path = ports/stm/st_driver/stm32f4xx_hal_driver
-	url = https://github.com/STMicroelectronics/stm32f4xx_hal_driver.git
 [submodule "ports/stm/st_driver/cmsis_device_f0"]
 	path = ports/stm/st_driver/cmsis_device_f0
 	url = https://github.com/STMicroelectronics/cmsis_device_f0.git