powerpc/85xx: Refactor some defines out of corenet_ds.h

Move some SoC/board specific defines out of corenet_ds.h and into the
corresponding P3041DS/P4080DS/P5020.h.

We moved CONFIG_MMC, CONFIG_PCIE3, & CONFIG_FSL_NGPIXIS because the P3060
SoC/reference board does not have these devices and it will share the same
board code.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/include/configs/P5020DS.h b/include/configs/P5020DS.h
index dd8d442..4d990be 100644
--- a/include/configs/P5020DS.h
+++ b/include/configs/P5020DS.h
@@ -28,7 +28,12 @@
 #define CONFIG_PHYS_64BIT
 #define CONFIG_PPC_P5020
 
+#define CONFIG_FSL_NGPIXIS		/* use common ngPIXIS code */
+
+#define CONFIG_MMC
+#define CONFIG_NAND_FSL_ELBC
 #define CONFIG_FSL_SATA_V2
+#define CONFIG_PCIE3
 #define CONFIG_PCIE4
 
 #define CONFIG_ICS307_REFCLK_HZ		25000000  /* ICS307 ref clk freq */