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This adds the object "WiMAX" to ONC, which contains the basic properties
 AutoConnect (read/write)
 EAP (write-only)
 SignalStrength (read-only).
Also all general network properties like Name or ConnectionState are supported.

BUG=414417

Review URL: https://codereview.chromium.org/578823003

Cr-Commit-Position: refs/heads/master@{#295467}