powerpc: Remove configs/BSC9131RDB_NAND_SYSCLK100_defconfig board

DM_SPI and other driver model migration deadlines
are expired for this board.

Remove it.

Patch-cc: Poonam Aggrwal <poonam.aggrwal@nxp.com>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
15 files changed