MIPS: SNI: 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 0ba692c..e391b6d 100644
--- a/arch/mips/Kbuild.platforms
+++ b/arch/mips/Kbuild.platforms
@@ -9,6 +9,7 @@
 platforms += mipssim
 platforms += pmc-sierra
 platforms += sgi-ip27
+platforms += sni
 platforms += vr41xx
 
 # include the platform specific files