staging: evict abandoned 68360serial.c driver from the kernel

commit 3a0db721

    "TTY: serial, move 68360 driver to staging"

did so because the driver had remained broken since 2008.  It also
added this text to the TODO file:

   "If no one steps up to adopt any of these drivers, they will
    be removed in the 3.4 release."

A quick search on the internet doesn't reveal anyone actively
trying to update/fix this driver, so follow through on the above
and remove it from the pending 3.4 release.

Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Alan Cox <alan@linux.intel.com>
Cc: Greg Ungerer <gerg@snapgear.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>