asus-acpi: remove duplicate comparison of asus_model strings

These tests already occur elsewhere

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Cc: Corentin Chary <corentincj@iksaif.net>
Cc: Karol Kozimor <sziwan@users.sourceforge.net>
Cc: Len Brown <lenb@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>