Document known issue: Keyboard and trackpad do not work on 2016/17 Macbook Pro

MacBook Pro 15-inch 2016 with touch bar (model MacBookPro13,3)

Tails boots to greeter but neither the trackpad nor keyboard work, so the system is unusable without external peripherals.

Feature Branch: doc/13576-known-issues-recent-mbp

Original created by @Drypht on 13576 (Redmine)

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