sh: 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/arch/sh/include/asm/Kbuild b/arch/sh/include/asm/Kbuild
index 43910cd..f1a2a0d 100644
--- a/arch/sh/include/asm/Kbuild
+++ b/arch/sh/include/asm/Kbuild
@@ -6,3 +6,4 @@
 unifdef-y += unistd_64.h
 unifdef-y += posix_types_32.h
 unifdef-y += posix_types_64.h
+unifdef-y += swab.h