powerpc/p2040: Add various p2040 specific information

Add P2040 SoC specific information:
* SERDES Table
* Added p2040 to cpu_type_list and SVR list
* Added number of LAWs for p2040
* Set CONFIG_MAX_CPUS to 4 for p2040

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h
index 646e0db..fcee1a2 100644
--- a/arch/powerpc/include/asm/processor.h
+++ b/arch/powerpc/include/asm/processor.h
@@ -1058,6 +1058,8 @@
 #define SVR_P2010_E	0x80EB00
 #define SVR_P2020	0x80E200
 #define SVR_P2020_E	0x80EA00
+#define SVR_P2040	0x821000
+#define SVR_P2040_E	0x821800
 #define SVR_P3041	0x821103
 #define SVR_P3041_E	0x821903
 #define SVR_P4040	0x820100