[FIX] account, portal, sale, website_sale: get correct company_name

This commit fixes multiple issues regarding the /shop/address and /my/account
forms where both are displaying `vat` and `company_name` fields.

1. For a company's child partner, the `company_name` was empty instead of
showing its company name (the name of its parent_id which is the commercial
entity).
2. It was possible for a child partner to edit its `vat` (which is a field
synced from parent to children, but only parent should be able to edit it as
it is the commercial entity, see 4a1bc45934efd and 98b1fffd4e).
3. Company name now share the exact same condition than the vat field in order
to be editable (as it should have been). It was possible to edit vat but not
company name on /my/account.

Steps to reproduce the bug:

- Create a company contact CO with a VAT number
- Create a contact C in CO with portal access
- Log with C and go to the shop
- In the checkout, try to edit the address details

opw-2007368

closes odoo/odoo#34564

Signed-off-by: Jérémy Kersten (jke) <jke@openerp.com>

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