contrib: Re-apply changes from initial import

These changes are from:

cb78150d86

A comment was removed from the top of the file noting its modification no need
for this as the changes are in a separate commit now.

contrib/bsps/arm/stm32h7/cmsis-device-h7/Include/stm32h7xx.h

@@ -37,6 +37,9 @@
 #ifndef STM32H7xx_H
 #define STM32H7xx_H
 
+#ifdef __rtems__
+#include <bspopts.h>
+#endif /* __rtems__ */
 #ifdef __cplusplus
  extern "C" {
 #endif /* __cplusplus */