tty: serial: crisv10: Drop remaining code for CRISv10 CPU simulator

The Kconfig symbol SVINTO_SIM got dropped in commit e269a869 ("Drop
code for CRISv10 CPU simulator"). Now drop the remaining code for that
simulator.

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>