Copyright for linux-riscv source package in Focal

This is the Ubuntu prepackaged version of the Linux kernel.
Linux was written by Linus Torvalds 
and others.

This package was put together by the Ubuntu Kernel Team, from
sources retrieved from upstream linux git.
The sources may be found at most Linux ftp sites, including 
ftp://ftp.kernel.org/pub/linux/kernel/

This package is currently maintained by the
Ubuntu Kernel Team 

Linux is copyrighted by Linus Torvalds and others.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 dated June, 1991.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

On Ubuntu Linux systems, the complete text of the GNU General
Public License v2 can be found in `/usr/share/common-licenses/GPL-2'.