schedule: ll: allocate coherent memory in userspace mode too

Also when userspace is used scheduler instances have to be allocated
uncached.

Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>

Author: lyakh

src/schedule/zephyr_ll.c

@@ -623,7 +623,7 @@ __cold int zephyr_ll_scheduler_init(struct ll_schedule_domain *domain)
 
 #if CONFIG_SOF_USERSPACE_LL
 	heap = zephyr_ll_user_heap();
-	flags = SOF_MEM_FLAG_USER;
+	flags = SOF_MEM_FLAG_USER | SOF_MEM_FLAG_COHERENT;
 #endif
 	tr_dbg(&ll_tr, "init on core %d", core);