powerpc/p5020: Add various p5020 related defines (and p5010)

There are various locations that we have chip specific info:

* Makefile for which ddr code to build
* Added p5020 & p5010 to cpu_type_list and SVR list
* Added number of LAWs for p5020
* Set CONFIG_MAX_CPUS to 2 for p5020

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/arch/powerpc/cpu/mpc85xx/Makefile b/arch/powerpc/cpu/mpc85xx/Makefile
index 4ee0e9a..2656dde 100644
--- a/arch/powerpc/cpu/mpc85xx/Makefile
+++ b/arch/powerpc/cpu/mpc85xx/Makefile
@@ -59,6 +59,7 @@
 COBJS-$(CONFIG_P2010)	+= ddr-gen3.o
 COBJS-$(CONFIG_P2020)	+= ddr-gen3.o
 COBJS-$(CONFIG_PPC_P4080)	+= ddr-gen3.o
+COBJS-$(CONFIG_PPC_P5020)	+= ddr-gen3.o
 
 COBJS-$(CONFIG_CPM2)	+= ether_fcc.o
 COBJS-$(CONFIG_OF_LIBFDT) += fdt.o