[POWERPC] 85xx: Renamed mpc8544_ds.c to mpc85xx_ds.c

Renamed the mpc8544_ds.c board code to mpc85xx_ds.c to make it more
generic in prep for other boards based on the same platform.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/arch/powerpc/configs/mpc8544_ds_defconfig b/arch/powerpc/configs/mpc8544_ds_defconfig
index 86582ae..150221f 100644
--- a/arch/powerpc/configs/mpc8544_ds_defconfig
+++ b/arch/powerpc/configs/mpc8544_ds_defconfig
@@ -136,7 +136,7 @@
 # CONFIG_MPC8560_ADS is not set
 # CONFIG_MPC85xx_CDS is not set
 # CONFIG_MPC85xx_MDS is not set
-CONFIG_MPC8544_DS=y
+CONFIG_MPC85xx_DS=y
 CONFIG_MPC85xx=y
 CONFIG_MPIC=y
 # CONFIG_MPIC_WEIRD is not set