wifi: Support 11b only mode

upgrade @1.4::ConnectionCapabilities to include legacyMode, update
corresponding 1.3 VTS test and add new 1.4 VTS test files

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: Id4fd567401289091a5d74a770e759eee326c3873
diff --git a/wifi/supplicant/1.4/Android.bp b/wifi/supplicant/1.4/Android.bp
index ff2a8bc..81e1738 100644
--- a/wifi/supplicant/1.4/Android.bp
+++ b/wifi/supplicant/1.4/Android.bp
@@ -4,7 +4,9 @@
     name: "android.hardware.wifi.supplicant@1.4",
     root: "android.hardware",
     srcs: [
+        "types.hal",
         "ISupplicant.hal",
+        "ISupplicantStaIface.hal",
     ],
     interfaces: [
         "android.hardware.wifi.supplicant@1.0",