sparc: unify kernel/idprom.c

o in sparc32 variant removed prom_halt in warning situations
o ifdef out sparc32 specific code

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

arch/sparc/kernel/Makefile

@@ -22,7 +22,7 @@ obj-y                   += process_$(BITS).o
 obj-y                   += signal_$(BITS).o
 obj-$(CONFIG_SPARC32)   += ioport.o
 obj-y                   += setup_$(BITS).o
-obj-y                   += idprom_$(BITS).o
+obj-y                   += idprom.o
 obj-y                   += sys_sparc_$(BITS).o
 obj-$(CONFIG_SPARC32)   += systbls_32.o
 obj-y                   += time_$(BITS).o