According to new qspi driver, some properties like "bus-num, num-cs, big-endian" are no longer used. Device endiannes can be determined from device-type data in driver. Now use board specific compatibles, generic node names and specific labels to align with linux device-tree properties. Also consolidate spi-max-frequency to 50Mhz treewide. Signed-off-by: Kuldeep Singh <kuldeep.singh@nxp.com> Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>