Reduce default value of gMaxLIModulatedDTIM from 10 to 5
to shorten the listen interval. It provides better
connectivity when AP has a large DTIM Period or
Beacon Interval.
Also, move the ini definition to sta header file from
sap header file.
Change-Id: I9661c6fc623949cf8b260043e8da7448b496d57f
CRs-Fixed: 2780070