sm8450-common: Switch to unified supplicant service rc entry

Change-Id: I6cc5a1d062c19be570d5631cb7ea9c760a992aef

BoardConfigCommon.mk

@@ -255,4 +255,5 @@ WIFI_DRIVER_STATE_OFF := "OFF"
 WIFI_DRIVER_STATE_ON := "ON"
 WIFI_HIDL_FEATURE_AWARE := true
 WIFI_HIDL_FEATURE_DUAL_INTERFACE := true
+WIFI_HIDL_UNIFIED_SUPPLICANT_SERVICE_RC_ENTRY := true
 WPA_SUPPLICANT_VERSION := VER_0_8_X