MIPS: IP32: 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 4d87f3d..8a8f99b 100644
--- a/arch/mips/Kbuild.platforms
+++ b/arch/mips/Kbuild.platforms
@@ -11,6 +11,7 @@
 platforms += pmc-sierra
 platforms += sgi-ip22
 platforms += sgi-ip27
+platforms += sgi-ip32
 platforms += sni
 platforms += vr41xx