Hide 'Share' button and 'Add device' preference for a Passpoint Wi-Fi network

Passpoint provisioning is much different from other Wi-Fi networks and ZXing
does not support a QR code format to share a passpoint Wi-Fi network. We
should not show any button to share a passpoint Wi-Fi network.

Bug: 130609037
Test: manual
Change-Id: Ie2538ed9e030e5aa2e88452b50b6592223ca46a8