core: mmu: fix memory regions found from ff-a manifest

Fix the 6th parameter of add_phys_mem() in collect_device_mem_ranges()
that has to be the size of memory region and not the end address of the
region.

Fixes: 72a6827 ("core: arm: SPMC obtain device memory info from DTB")
Signed-off-by: Sungbae Yoo <sungbaey@nvidia.com>
Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

core/mm/core_mmu.c

@@ -997,7 +997,7 @@ static void collect_device_mem_ranges(struct tee_mmap_region *memory_map,
 		}
 
 		add_phys_mem(memory_map, num_elems, name, MEM_AREA_IO_SEC,
-			     base, base + page_count * SMALL_PAGE_SIZE, last);
+			     base, page_count * SMALL_PAGE_SIZE, last);
 	}
 }