devicetree: add `DT_NODE_HAS_STATUS_OKAY`

We already have `DT_HAS_COMPAT_STATUS_OKAY` and
`DT_NUM_INST_STATUS_OKAY`, it seems intuitive to assume that
`DT_NODE_HAS_STATUS_OKAY` exists, so much so that it was used
before it's implemented.

This patch implements `DT_NODE_HAS_STATUS_OKAY`, which is
equivalent to: `DT_NODE_HAS_STATUS(<node_id>, okay)`

Added test for it in `tests/lib/devicetree/api`

Signed-off-by: Yong Cong Sin <ycsin@meta.com>
Signed-off-by: Yong Cong Sin <yongcong.sin@gmail.com>