x86: rename ia32*/*.c files have ia32 as their base name

Rename system.c and platform_config.c files in preparation for merging the ia32
based platforms to remove code duplication.

Change-Id: I88caf5294817e06c235379e92cd8ee7472e88028
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>

arch/x86/platforms/ia32/Makefile

@@ -3,5 +3,5 @@ ccflags-y +=-I$(srctree)/include/drivers
 ccflags-y +=-I$(srctree)/drivers
 asflags-y := ${ccflags-y}
 
-obj-y += platform_config.o
-obj-y += system.o
+obj-y += ia32_config.o
+obj-y += ia32.o

arch/x86/platforms/ia32_pci/Makefile

@@ -3,5 +3,5 @@ ccflags-y += -I$(srctree)/drivers
 
 asflags-y := ${ccflags-y}
 
-obj-y += platform_config.o
-obj-y += system.o
+obj-y += ia32_pci_config.o
+obj-y += ia32_pci.o