MLK-21829 dts: imx8qxp: Update DTSi files and binding header files

MLK-21829 dts: imx8qxp: Update DTSi files and binding header files

Update the imx8qxp/dx/dxp DTSi files from imx_4.14.y kernel
(rel_imx_4.14.98_2.0.0_ga_rc1)

Add extra support used in u-boot:
1. Add alias for FSPI nodes
2. Add GPIO alias which is used as seq number in u-boot DM GPIO driver.
3. Add i2c alias for i2c0 to i2c3.
4. Add i2c alias for mipi0/mipi1 i2c0.
5. Add "u-boot,dm-pre-reloc" to thermal node in QXP DTSi
6. Add USB alias for OTG and USB3 ports.

Signed-off-by: Ye Li <ye.li@nxp.com>