This enables links from the settings to the cell broadcast app for
configuring the behavior for received cell broadcasts.
While most hardware overlays already enabled this setting, it's nothing
hardware related, so it makes sense to set here globally for any device.
I'll also open a PR in `vendor_hardware_overlay` to remove the setting
from all overlays there.
Fix the base64 encoded of the x509 cert for Google Webview.
You can check this by doing a base64-decode and then using openssl:
openssl x509 -in gwv.der -inform DER -text -noout
