acerhdf: make needlessly global symbols static

The following symbols are needlessly defined global:

thz_dev
cl_dev
acerhdf_dev
acerhdf_dev_ops
acerhdf_cooling_ops

This patch makes the symbols static.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Borislav Petkov <bp@alien8.de>
Acked-by: Peter Feuerer <peter@piie.net>
Cc: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Matthew Garrett <mjg@redhat.com>