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/sh/include/asm/Kbuild b/arch/sh/include/asm/Kbuild
index 46cb934..0eed47b 100644
--- a/arch/sh/include/asm/Kbuild
+++ b/arch/sh/include/asm/Kbuild
@@ -3,8 +3,7 @@
 header-y += cachectl.h
 header-y += cpu-features.h
 header-y += hw_breakpoint.h
-
-unifdef-y += unistd_32.h
-unifdef-y += unistd_64.h
-unifdef-y += posix_types_32.h
-unifdef-y += posix_types_64.h
+header-y += posix_types_32.h
+header-y += posix_types_64.h
+header-y += unistd_32.h
+header-y += unistd_64.h