test: dm: add test item for ofnode_get_addr() and ofnode_get_size()

Add test item for getting address and size functions

Test the following function:
- ofnode_get_addr()
- ofnode_get_size()

Signed-off-by: Chen Guanqiao <chenguanqiao@kuaishou.com>
Reviewed-by: Simon Glass <sjg@chromium.org>