Update i.MX6ul dtsi file and add mx6ul 14x14 and 9x9 evk DTS file
to latest in kernel.
To support DM QSPI driver, modify the DTS files with adding a spi0
alias for qspi node and changing the the n25q256a flash node's compatible
to "spi-flash"

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