[MIPS] Delete leftovers of old pcspeaker support.

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

arch/mips/kernel/Makefile

@@ -76,7 +76,6 @@ obj-$(CONFIG_PROC_FS)		+= proc.o
 obj-$(CONFIG_64BIT)		+= cpu-bugs64.o
 
 obj-$(CONFIG_I8253)		+= i8253.o
-obj-$(CONFIG_PCSPEAKER)		+= pcspeaker.o
 
 obj-$(CONFIG_KEXEC)		+= machine_kexec.o relocate_kernel.o
 obj-$(CONFIG_EARLY_PRINTK)	+= early_printk.o