parisc: Handle kgdb breakpoints only in kernel context

stable inclusion
from stable-v5.10.181
commit de0d7dd5efd44515a785d6bdffa4cc04516da6c8
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8GJZJ

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=de0d7dd5efd44515a785d6bdffa4cc04516da6c8



--------------------------------

commit 6888ff04 upstream.

The kernel kgdb break instructions should only be handled when running
in kernel context.

Cc: <stable@vger.kernel.org> # v5.4+
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>
(cherry picked from commit 05bee013)