powerpc: Rename files to have consistent _32/_64 suffixes

This doesn't change any code, just renames things so we consistently
have foo_32.c and foo_64.c where we have separate 32- and 64-bit
versions.

Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/lib/Makefile b/arch/powerpc/lib/Makefile
index 347f979..a8cedb9 100644
--- a/arch/powerpc/lib/Makefile
+++ b/arch/powerpc/lib/Makefile
@@ -3,7 +3,7 @@
 #
 
 obj-y			:= strcase.o string.o
-obj-$(CONFIG_PPC32)	+= div64.o copy32.o checksum.o
-obj-$(CONFIG_PPC64)	+= copypage.o copyuser.o memcpy.o usercopy.o \
-			   sstep.o checksum64.o
+obj-$(CONFIG_PPC32)	+= div64.o copy_32.o checksum_32.o
+obj-$(CONFIG_PPC64)	+= copypage_64.o copyuser_64.o memcpy_64.o \
+			   usercopy_64.o sstep.o checksum_64.o mem_64.o
 obj-$(CONFIG_PPC_ISERIES) += e2a.o