auxdisplay: ht16k33: Move ht16k33_linedisp_ops down

We will need the update functions to be defined before
ht16k33_linedisp_ops. Move the latter down in the code.
No functional change intended.

Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Robin van der Gracht <robin@protonic.nl>
Tested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>