dts: imx6ul_evk: Add DTS files for 14x14 EVK and 9x9 EVK boards

Add the board DTS files for 14x14 EVK and 9x9 EVK. They are necessary
for converting to use u-boot DM driver.

Two -u-boot.dtsi are added to modify compatible string of SPI flash
device to "spi-flash".

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