Android Nougat AOSP Changes

Changes from 7.0.0_r19 (NBD91P) to 7.0.0_r21 (N5D91L):

Warning Releases with no significant changes other than version bump in platform/build component are likely to only feature proprietary binary blob (e.g. firmwares) changes.

Newly Added Components (0):

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Removed Components (0):

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Updated Components (1):