[POWERPC] 83xx: Renamed MPC8323 MDS dts and defconfig to match other boards

Renamed the MPC8323 MDS and defconfig to match the naming convention followed
by other MDS boards.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

diff --git a/arch/powerpc/boot/dts/mpc8323emds.dts b/arch/powerpc/boot/dts/mpc832x_mds.dts
similarity index 100%
rename from arch/powerpc/boot/dts/mpc8323emds.dts
rename to arch/powerpc/boot/dts/mpc832x_mds.dts

diff --git a/arch/powerpc/configs/mpc832xemds_defconfig b/arch/powerpc/configs/mpc832x_mds_defconfig
similarity index 100%
rename from arch/powerpc/configs/mpc832xemds_defconfig
rename to arch/powerpc/configs/mpc832x_mds_defconfig