Prefix and suffix are not prefilled in the quote shipping address

[AntonEvers]

Preconditions

1. enable customer prefix and suffix in the customer config
2. create an account with a prefix and a suffix

Steps to reproduce

1. start an order, using an account with a prefix and a suffix
2. visit the shipping address step in the checkout

Expected result

1. shipping address should be prefilled with prefix, firstname, middlename, lastname, suffix

Actual result

1. shipping address is prefilled with firstname, lastname

the middle name is already added in #8878 (issue #8879)

[magento-team]

Internal ticket to track issue progress: MAGETWO-69848