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This patch removes the 128 device limit that was imposed on input
devices. Instead of using a fixed size array, a flat_map is used.

The DeviceDataManager also removes entries from the flat_map if a
device has been disconnected.

Test: Manually tested on the faulty device.
Bug: b/137907174
Change-Id: I5e5803aa4fb853bf4129515767c60a2dec81686d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1913717Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Michael Spang <spang@chromium.org>
Commit-Queue: Malay Keshav <malaykeshav@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715624}