Remove legacy filtering from GP2 sensor
* Removes 20 samples per event in same "bin" hack
* Removes averaging over 6 samples
* Set light_adc_fuzz to 1 to prevent "the same" events from not being sent
* Should resolve many auto-brightness issues
* PROBABLY SHOULD ACCEPT Aries WHEN MOVING FORWARD
* See notes below

* Keep the sysfs -- other apps may be using it
* Adopt Aries set-up/tear-down sequence
  * Note that the older driver was calling free_irq(gp2a->irq, 0)
* Hack in constants to replace gp2a->pdata->light_adc_max and ->light_adc_fuzz (need linux/input.h EV_VERSION 0x010001)
* Set LIGHT_ADC_FUZZ to 1 to prevent "filtering" from devices/input/input.c
  * User-land is expecting a steady stream of events and does its own filtering; a problem especially at low light levels