mn10300: introduce asm/swab.h

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/asm-mn10300/Kbuild b/include/asm-mn10300/Kbuild
index c68e168..27b108a 100644
--- a/include/asm-mn10300/Kbuild
+++ b/include/asm-mn10300/Kbuild
@@ -1 +1,2 @@
 include include/asm-generic/Kbuild.asm
+unifdef-y += swab.h