During CU and low rssi based roam triggers, consider AP as roam candidate
only if its roam score is better than connected AP score by at least
min_roam_score_delta.
User configures this candidate minimum roam score delta value using
"min_roam_score_delta" INI. User can set candidate minimum score delta
value between 0 to 10000 and default value is 1850.
Firmware will trigger roaming only if roam score of candidate AP is
greater than "min_roam_score_delta" & "roam_score_delta" values of
connected AP.
Change-Id: I180e769b5629aa405dbd89ed73e39e228adf92db
CRS-Fixed: 2614117
83c11be72e