nrf/drivers: Add support for using flash block device with SoftDevice.

Update flash.c to also be compiled in when
MICROPY_HW_ENABLE_INTERNAL_FLASH_STORAGE is enabled and SoftDevice is
present.

Update bluetooth/ble_drv.c to forward flash events to flash.c when
MICROPY_HW_ENABLE_INTERNAL_FLASH_STORAGE is enabled.

ports/nrf/drivers/bluetooth/ble_drv.c

@@ -929,7 +929,7 @@ void ble_drv_discover_descriptors(void) {
 
 static void sd_evt_handler(uint32_t evt_id) {
     switch (evt_id) {
-#if MICROPY_MBFS
+#if MICROPY_HW_ENABLE_INTERNAL_FLASH_STORAGE || MICROPY_MBFS
         case NRF_EVT_FLASH_OPERATION_SUCCESS:
             flash_operation_finished(FLASH_STATE_SUCCESS);
             break;

ports/nrf/drivers/flash.c

@@ -26,7 +26,7 @@
 
 #include "py/mpconfig.h"
 
-#if MICROPY_MBFS && BLUETOOTH_SD
+#if (MICROPY_HW_ENABLE_INTERNAL_FLASH_STORAGE || MICROPY_MBFS) && BLUETOOTH_SD
 
 #include "drivers/flash.h"
 #include "drivers/bluetooth/ble_drv.h"
@@ -129,4 +129,4 @@ void flash_write_bytes(uint32_t dst, const uint8_t *src, uint32_t num_bytes) {
     }
 }
 
-#endif // MICROPY_MBFS
+#endif // (MICROPY_HW_ENABLE_INTERNAL_FLASH_STORAGE || MICROPY_MBFS) && BLUETOOTH_SD