MIPS: Sibyte: Migrate to new platform makefile style.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/Kbuild.platforms b/arch/mips/Kbuild.platforms
index 5a45333..e0fb370 100644
--- a/arch/mips/Kbuild.platforms
+++ b/arch/mips/Kbuild.platforms
@@ -18,6 +18,7 @@
 platforms += sgi-ip22
 platforms += sgi-ip27
 platforms += sgi-ip32
+platforms += sibyte
 platforms += sni
 platforms += vr41xx
 platforms += wrppmc