pfSense/pfsense a4bcbc3src/usr/local/www interfaces.php

Add additional DHCPv6 prefix delegation size options to dropdown list on interface settings.
- implements #9590

(cherry picked from commit 51dc008bfebef50bc4be9ff2a894e176ba013866)
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+1-1src/usr/local/www/interfaces.php
+1-11 files

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