Input: elan_i2c - handle devices with patterns above 1

Extend fetching and parsing parameters of the controllers to devices with
"patterns" above 1 (which currently should be handled in the same fashion
as devices with pattern 1).

Signed-off-by: Jingle Wu <jingle.wu@emc.com.tw>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>