[nrf fromlist] samples: usb: uac2: align feedback_nrf to changes in nrfx

Upstream PR #: 96858

Signed-off-by: Michał Bainczyk <[email protected]>

Author: mib1-nordic

samples/subsys/usb/uac2_explicit_feedback/src/feedback_nrf.c

@@ -64,7 +64,7 @@ static const nrfx_gpiote_t gpiote =
 	NRFX_GPIOTE_INSTANCE(FEEDBACK_GPIOTE_INSTANCE_NUMBER);
 
 static const nrfx_timer_t feedback_timer_instance =
-	NRFX_TIMER_INSTANCE(FEEDBACK_TIMER_INSTANCE_NUMBER);
+	NRFX_TIMER_INSTANCE(NRF_TIMER_INST_GET(FEEDBACK_TIMER_INSTANCE_NUMBER));
 
 /* See 5.12.4.2 Feedback in Universal Serial Bus Specification Revision 2.0 for
  * more information about the feedback. There is a direct implementation of the

samples/subsys/usb/uac2_implicit_feedback/src/feedback_nrf.c

@@ -52,7 +52,7 @@ static inline void feedback_target_init(void)
 #endif
 
 static const nrfx_timer_t feedback_timer_instance =
-	NRFX_TIMER_INSTANCE(FEEDBACK_TIMER_INSTANCE_NUMBER);
+	NRFX_TIMER_INSTANCE(NRF_TIMER_INST_GET(FEEDBACK_TIMER_INSTANCE_NUMBER));
 
 /* While it might be possible to determine I2S FRAMESTART to USB SOF offset
  * entirely in software, the I2S API lacks appropriate timestamping. Therefore