ace: mm: tlb: Ignore unmappig error in driver initalization

The sys_mm_drv_unmap_region_initial function is responsible for unmapping
all unused virtual memory during tlb driver initialization. Most addresses
will not have a mapped page. Ignore the error code indicating unmapped
memory that will occur when trying to unmap.

Signed-off-by: Adrian Warecki <adrian.warecki@intel.com>

drivers/mm/mm_drv_intel_adsp_mtl_tlb.c

@@ -487,8 +487,15 @@ static int sys_mm_drv_unmap_region_initial(void *virt_in, size_t size)
 
 	for (offset = 0; offset < size; offset += CONFIG_MM_DRV_PAGE_SIZE) {
 		uint8_t *va = (uint8_t *)virt + offset;
+		uintptr_t unused;
 
-		int ret2 = sys_mm_drv_unmap_page_wflush(va, false);
+		int ret2 = sys_mm_drv_page_phys_get(va, &unused);
+		if (ret2) {
+			/* Skip unmapped pages */
+			continue;
+		}
+
+		ret2 = sys_mm_drv_unmap_page_wflush(va, false);
 
 		if (ret2 != 0) {
 			__ASSERT(false, "cannot unmap %p\n", va);