staging: unisys: visornic: Move function to appropriate location

Move function add_physinfo_entries() to visornic_main.c, which is the
only function where it is used.

Signed-off-by: David Binder <david.binder@unisys.com>
Signed-off-by: David Kershner <david.kershner@unisys.com>
Reviewed-by: Tim Sell <timothy.sell@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>