Hardwareinfo: remove platform sign key

Sign with default key

Test: manually, connect to wifi, reboot and check logcat, no new error
      message after apply patch
      adb logcat |egrep "Hardware|System.err"
Bug: 162295589

Change-Id: Ic8bbcc142f0a4dd3cadee1444858cde7b316ef02
Signed-off-by: Denny cy Lee <dennycylee@google.com>

diff --git a/vendor/qcom/common/seapp_contexts b/vendor/qcom/common/seapp_contexts
index 5f7cdbf..d2fd37e 100644
--- a/vendor/qcom/common/seapp_contexts
+++ b/vendor/qcom/common/seapp_contexts

@@ -15,7 +15,7 @@
 user=_app seinfo=tango name=com.google.tango:app domain=untrusted_app type=app_data_file levelFrom=user
 
 # Hardware Info Collection
-user=_app seinfo=platform name=com.google.android.hardwareinfo domain=hardware_info_app type=app_data_file levelFrom=user
+user=_app isPrivApp=true name=com.google.android.hardwareinfo domain=hardware_info_app type=app_data_file levelFrom=user
 
 # Use a custom domain for GoogleCamera, to allow for Hexagon DSP access
 user=_app seinfo=google name=com.google.android.GoogleCamera domain=google_camera_app type=app_data_file levelFrom=user