[MIPS] SMTC: Build fix: Fix filename in Makefile

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/mti-malta/Makefile

@@ -15,6 +15,6 @@ obj-$(CONFIG_EARLY_PRINTK)	+= malta-console.o
 obj-$(CONFIG_PCI)		+= malta-pci.o
 
 # FIXME FIXME FIXME
-obj-$(CONFIG_MIPS_MT_SMTC)	+= malta_smtc.o
+obj-$(CONFIG_MIPS_MT_SMTC)	+= malta-smtc.o
 
 EXTRA_CFLAGS += -Werror