Removing redundant Light sensor events

Removing redundant Light sensor events

LIGHT_LUX_DATA_SET and LIGHT_EVENT_LUX_DATA_REPORT_ON_TIME were the same
LIGHT_LUX_DATA_SET has been removed.

LIGHT_LUX_DATA_SET was used for polling events and LIGHT_EVENT_LUX_DATA_REPORT_ON_TIME was used for event driven
Since both these represent the same light sensor event, DATA_SET type has been removed.

And LIGHT_EVENT_LUX_DATA_REPORT_ON_TIME has been renamed to LIGHT_LUX_DATA_EVENT to make it simpler.

The change has been tested on rd-pq device for all sensord API and all API were found to be working.

Change-Id: I44a761251a6fc9e78333f022b131c2562d65ccb9