archs: replace unifdef-y with header-y

unifdef-y and header-y have same semantic, so drop unifdef-y

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/arch/cris/include/asm/Kbuild b/arch/cris/include/asm/Kbuild
index d5b6319..956eea2 100644
--- a/arch/cris/include/asm/Kbuild
+++ b/arch/cris/include/asm/Kbuild
@@ -4,8 +4,7 @@
 header-y += arch-v32/
 
 header-y += ethernet.h
+header-y += etraxgpio.h
+header-y += rs485.h
 header-y += rtc.h
 header-y += sync_serial.h
-
-unifdef-y += etraxgpio.h
-unifdef-y += rs485.h