MLK-22339: mx6qsabreauto: configs: add default mtdids and mtdparts

MLK-22339: mx6qsabreauto: configs: add default mtdids and mtdparts
configs

set the i.MX6q default mtdids value as
"nor0=8000000.nor,nand0=gpmi-nand", nandbcb can directly write to the
nandboot partition after u-boot brings up.

=> nandbcb update $loadaddr nandboot 924672
Device nor0 not found!
current device is invalid, skip it and check the next one
device 0 offset 0x0, size 0x924672
Erasing at 0x3f00000 -- 100% complete.
NAND fw write: 0x200000 offset, 0x928000 bytes written: OK

Signed-off-by: Yang-yang Guo <alice.guo@nxp.com>