sparc: prepare prom/ for unification

- rename files where sparc64 uses identical names to *_32.c
- refactor Makefile (but keep linking order)

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc/prom/Makefile

@@ -2,5 +2,16 @@
 # Linux.
 #
 
-lib-y := bootstr.o devmap.o devops.o init.o memory.o misc.o mp.o \
+lib-y                 := bootstr_$(BITS).o
-	 palloc.o ranges.o segment.o console.o printf.o tree.o
+lib-$(CONFIG_SPARC32) += devmap.o
+lib-y                 += devops_$(BITS).o
+lib-y                 += init_$(BITS).o
+lib-$(CONFIG_SPARC32) += memory.o
+lib-y                 += misc_$(BITS).o
+lib-$(CONFIG_SPARC32) += mp.o
+lib-$(CONFIG_SPARC32) += palloc.o
+lib-$(CONFIG_SPARC32) += ranges.o
+lib-$(CONFIG_SPARC32) += segment.o
+lib-y                 += console_$(BITS).o
+lib-y                 += printf_$(BITS).o
+lib-y                 += tree_$(BITS).o