[MIPS] Put an end to <asm/serial.h>'s long and annyoing existence

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/kernel/Makefile b/arch/mips/kernel/Makefile
index 4924626..bb25dd8 100644
--- a/arch/mips/kernel/Makefile
+++ b/arch/mips/kernel/Makefile
@@ -68,3 +68,5 @@
 obj-$(CONFIG_EARLY_PRINTK)	+= early_printk.o
 
 CFLAGS_cpu-bugs64.o	= $(shell if $(CC) $(CFLAGS) -Wa,-mdaddi -c -o /dev/null -xc /dev/null >/dev/null 2>&1; then echo "-DHAVE_AS_SET_DADDI"; fi)
+
+obj-$(CONFIG_HAVE_STD_PC_SERIAL_PORT)	+= 8250-platform.o