frv: 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-frv/Kbuild b/include/asm-frv/Kbuild
index 0f8956d..1f44e7c 100644
--- a/include/asm-frv/Kbuild
+++ b/include/asm-frv/Kbuild
@@ -3,3 +3,4 @@
 header-y += registers.h
 
 unifdef-y += termios.h
+unifdef-y += swab.h