MIPS: Malta: 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 acc3dc8..4d87f3d 100644
--- a/arch/mips/Kbuild.platforms
+++ b/arch/mips/Kbuild.platforms
@@ -7,6 +7,7 @@
 platforms += jazz
 platforms += loongson
 platforms += mipssim
+platforms += mti-malta
 platforms += pmc-sierra
 platforms += sgi-ip22
 platforms += sgi-ip27