drivers: flash: stm32_h7: invalidate data cache after flash write

STM32H7 platforms now enable cache management by default.
To ensure data coherency after flash writes, invalidate cache
lines to the region written.
This prevents stale data and ensures proper memory visibility.

Signed-off-by: Fabrice DJIATSA <[email protected]>

Author: djiatsaf-st

drivers/flash/flash_stm32h7x.c

@@ -791,6 +791,9 @@ static int flash_stm32h7_write(const struct device *dev, off_t offset, const voi
 		rc = rc2;
 	}
 
+#ifdef CONFIG_DCACHE
+	flash_stm32h7_flush_caches(dev, offset, len);
+#endif
 	flash_stm32_sem_give(dev);
 
 	return rc;