add mobile_push_enable preference

db_scripts/diff/9675.down

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+DELETE FROM provisioning.voip_preferences where attribute='mobile_push_enable';

db_scripts/diff/9675.up

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+INSERT INTO provisioning.voip_preferences (attribute, type, dom_pref, usr_pref, peer_pref, data_type, max_occur, description) VALUES('mobile_push_enable', 1, 1, 1, 0, 'boolean', 1, 'Send inbound call to Mobile Push server when called subscriber is not registered. This can't be used together with CFNA as call will be then simply forwarded.');