ACPI: remove redundant Acer blacklist entry

dmi_check_system() does sub-string matching using strstr(),
rather than exact string compares with !strcmp().

So delete the longer of the Acer blacklist entries, as its
function is just a redundant console message.

Spotted-by: Carlos Corbacho <carlos@strangeworlds.co.uk>
Signed-off-by: Len Brown <len.brown@intel.com>