LS2088ADB has one spansion flash s25fs512s of size 64M.

Add qspi dts entry for the board using compatibles as "jedec,spi-nor" to
probe flash successfully. Also, align properties with other board dts
properties.

Use dt-bindings constants in interrupts instead of using numbers.
Signed-off-by: Kuldeep Singh <kuldeep.singh@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>