wifi: hidl change to support 11b only mode

Detect 11a/g/b modes in association req/resp frames and pass them to HAL
through getConnectionCapabilities_1_4()

Bug: 163912712
Test: atest VtsHalWifiSupplicantV1_0TargetTest \
            VtsHalWifiSupplicantV1_1TargetTest \
	    VtsHalWifiSupplicantV1_2TargetTest \
	    VtsHalWifiSupplicantV1_3TargetTest \
	    VtsHalWifiSupplicantV1_4TargetTest
Test: manual test with 11b only AP to confirm 11b mode is detected and
passed to throughput predictor correctly.

Change-Id: I08fa2322e69a75bd666d2b3bd2514e2620035580
2 files changed