m68k: Kill CONFIG_WHIPPET_SERIAL

The Hisoft Whippet PCMCIA serial driver has been removed a long time ago, but
it's Kconfig symbol still existed.
Signed-off-by: NGeert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

arch/m68k/Kconfig

@@ -539,13 +539,6 @@ config AMIGA_BUILTIN_SERIAL
 
 	  To compile this driver as a module, choose M here.
 
-config WHIPPET_SERIAL
-	tristate "Hisoft Whippet PCMCIA serial support"
-	depends on AMIGA_PCMCIA
-	help
-	  HiSoft has a web page at <http://www.hisoft.co.uk/>, but there
-	  is no listing for the Whippet in their Amiga section.
-
 config MULTIFACE_III_TTY
 	tristate "Multiface Card III serial support"
 	depends on AMIGA