Add sepolicy for ISupplicantVendor aidl

This commit adds required sepolicy changes to avoid avc denial for new
vendor.qti.hardware.wifi.supplicant.ISupplicantVendor/default.

Change-Id: Ie272772338299eb2c684b1c3683e062b12ca486b
(cherry picked from commit e0e6534e6e384c33967b0a87f6834631dcbe2b5e)
diff --git a/legacy/vendor/common/service_contexts b/legacy/vendor/common/service_contexts
index 0ad1bc8..f3dc5ff 100644
--- a/legacy/vendor/common/service_contexts
+++ b/legacy/vendor/common/service_contexts
@@ -42,3 +42,4 @@
 com.qualcomm.qti.secota.service.SecotaNService u:object_r:secotad_service:s0
 com.qualcomm.qti.seemp.health                  u:object_r:seemp_health_daemon_service:s0
 com.qualcomm.qti.uceservice                    u:object_r:imsrcs_service:s0
+vendor.qti.hardware.wifi.supplicant.ISupplicantVendor/default         u:object_r:hal_wifi_supplicant_service:s0