m68k/serial: Remove references to obsolete CONFIG_SERIAL167

commit 51c9d654c2def97827395a7fbfd0c6f865c26544 ("Staging: delete tty
drivers") removed the MVME167 serial driver, but forgot to remove these
references.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
diff --git a/arch/m68k/Kconfig.devices b/arch/m68k/Kconfig.devices
index 6033f5d..e01eeb2 100644
--- a/arch/m68k/Kconfig.devices
+++ b/arch/m68k/Kconfig.devices
@@ -128,7 +128,7 @@
 
 config SERIAL_CONSOLE
 	bool "Support for serial port console"
-	depends on (AMIGA || ATARI || SUN3 || SUN3X || VME || APOLLO) && (ATARI_MFPSER=y || ATARI_MIDI=y || AMIGA_BUILTIN_SERIAL=y || MULTIFACE_III_TTY=y || SERIAL=y || SERIAL167 || DN_SERIAL)
+	depends on (AMIGA || ATARI || SUN3 || SUN3X || VME || APOLLO) && (ATARI_MFPSER=y || ATARI_MIDI=y || AMIGA_BUILTIN_SERIAL=y || MULTIFACE_III_TTY=y || SERIAL=y || DN_SERIAL)
 	---help---
 	  If you say Y here, it will be possible to use a serial port as the
 	  system console (the system console is the device which receives all