newport_con: make module's init & exit static using module_driver

newport_con: make module's init & exit static using module_driver

The compiler complains that newport_console_init and
newport_console_exit are not declared:
   drivers/video/console/newport_con.c:745:12: warning: no previous prototype for 'newport_console_init'
   drivers/video/console/newport_con.c:750:13: warning: no previous prototype for 'newport_console_exit'

Here, it translates into: they should be marked static. Do so by
converting the simple un/registration to module_driver().

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: dri-devel@lists.freedesktop.org
Cc: linux-fbdev@vger.kernel.org
Cc: linux-mips@vger.kernel.org
Link: https://lore.kernel.org/r/20200818085655.12071-3-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>