system(h7rs): add STM32H7RSxx system source files

Signed-off-by: Frederic Pillon <frederic.pillon@st.com>

Author: fpistm

system/STM32H7RSxx/stm32h7rsxx_hal_conf.h

@@ -0,0 +1,16 @@
+#ifndef __STM32H7RSxx_HAL_CONF_H
+#define __STM32H7RSxx_HAL_CONF_H
+
+#include "variant.h"
+
+/* STM32H7RSxx specific HAL configuration options. */
+#if __has_include("hal_conf_custom.h")
+#include "hal_conf_custom.h"
+#else
+#if __has_include("hal_conf_extra.h")
+#include "hal_conf_extra.h"
+#endif
+#include "stm32h7rsxx_hal_conf_default.h"
+#endif
+
+#endif /* __STM32H7RSxx_HAL_CONF_H */