drivers/flash/soc_flash_nrf: Include additional headers

Include <soc.h> to make the header file self-sufficent.

Signed-off-by: Ievgenii Meshcheriakov <[email protected]>

Author: eugmes

drivers/flash/soc_flash_nrf.h

@@ -8,6 +8,7 @@
 #define __SOC_FLASH_NRF_H__
 
 #include <kernel.h>
+#include <soc.h>
 
 #define FLASH_OP_DONE    (0) /* 0 for compliance with the driver API. */
 #define FLASH_OP_ONGOING  1