arm64: dts: imx8ulp-evk: add spi-nor device support

Add spi-nor support.
- 8 bit mode for RX/TX.
- Set the clock rate to 200MHz.
- add default/sleep pinctrl.

Co-developed-by: Haibo Chen <haibo.chen@nxp.com>
Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Signed-off-by: Han Xu <han.xu@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>