sdh: let the state observers be static

Let NRF_SDH_STATE_EVT_OBSERVER declare a static observer to prevent
linking errors when another observer with the same name is declared
somewhere else.

Signed-off-by: Emanuele Di Santo <[email protected]>

Author: lemrey

include/bm/softdevice_handler/nrf_sdh.h

@@ -150,8 +150,8 @@ struct nrf_sdh_state_evt_observer {
 #define NRF_SDH_STATE_EVT_OBSERVER(_observer, _handler, _ctx, _prio)                               \
 	PRIO_LEVEL_IS_VALID(_prio);                                                                \
 	static int _handler(enum nrf_sdh_state_evt, void *);                                       \
-	TYPE_SECTION_ITERABLE(struct nrf_sdh_state_evt_observer, _observer,                        \
-			      nrf_sdh_state_evt_observers, PRIO_LEVEL_ORD(_prio)) = {              \
+	static TYPE_SECTION_ITERABLE(struct nrf_sdh_state_evt_observer, _observer,                 \
+				     nrf_sdh_state_evt_observers, PRIO_LEVEL_ORD(_prio)) = {       \
 		.handler = _handler,                                                               \
 		.context = _ctx,                                                                   \
 	}