Revert "[nrf fromlist] mbox: temporary workaround for missing ic-msg"

This reverts commit 3850f28.

Author: meijemac

drivers/mbox/mbox_nrf_vevif_task_tx.c

@@ -5,14 +5,12 @@
 
 #define DT_DRV_COMPAT nordic_nrf_vevif_task_tx
 
-#include <zephyr/kernel.h>
 #include <zephyr/devicetree.h>
 #include <zephyr/drivers/mbox.h>
 
 #include <haly/nrfy_vpr.h>
 
 #define TASKS_IDX_MAX NRF_VPR_TASKS_TRIGGER_MAX
-#define VEVIF_RETRIGGER_DELAY	12
 
 struct mbox_vevif_task_tx_conf {
 	NRF_VPR_Type *vpr;
@@ -41,10 +39,6 @@ static int vevif_task_tx_send(const struct device *dev, uint32_t id, const struc
 
 	nrfy_vpr_task_trigger(config->vpr, nrfy_vpr_trigger_task_get(id));
 
-	k_busy_wait(VEVIF_RETRIGGER_DELAY);
-
-	nrfy_vpr_task_trigger(config->vpr, nrfy_vpr_trigger_task_get(id));
-
 	return 0;
 }