msm8976-common: wifi: smarter decisions on whether to use a 2- or 5Ghz AP

Implement a smarter system on whether to connect
to the provided 2Ghz or 5Ghz network.

Change-Id: Idd41e3d9a5e2bde3ea9b4873dffc4274d1530324
Signed-off-by: Alex Naidis <alex.naidis@linux.com>

wifi/WCNSS_qcom_cfg.ini

@@ -719,6 +719,11 @@ gTxChainMask1ss=0
 gRoamBmissFirstBcnt=25
 gRoamBmissFinalBcnt=35
 
+# Prefer connecting to 5Ghz AP
+# even if its RSSI is lower by 3dBm than the 2.4Ghz AP
+gRoamPrefer5GHz=1
+gSelect5GHzMargin=3
+
 END
 
 # Note: Configuration parser would not read anything past the END marker