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This is a reland of cdafb2ec

Original change's description:
> arc: bluetooth: Implement sending indications in GATT server
>
>  - Ensure that CCCD is added such that we can report the value change in
>    CCCD to Android in OnNotificationStart/Stop()
>  - Implement SendIndication() such that Android can call it
>
> Bug: b:78593133
> Test: Pass Android CtsVerifier test on server sending indication/notification
> Change-Id: I8b1a4be6596555003d6d447b4518f37632a45370
> Reviewed-on: https://chromium-review.googlesource.com/1119079
> Commit-Queue: Qiyu Hu <qiyuh@google.com>
> Reviewed-by: Luis Hector Chavez <lhchavez@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#572291}

Bug: b:78593133
Test: Build w/ is_debug = true
Change-Id: I4bd27b7c9bdf4b7c16f14e2d67a2a6647dc14ad6
Reviewed-on: https://chromium-review.googlesource.com/1125359Reviewed-by: Luis Hector Chavez <lhchavez@chromium.org>
Reviewed-by: Miao-chen Chou <mcchou@chromium.org>
Reviewed-by: Rahul Chaturvedi <rkc@chromium.org>
Commit-Queue: Qiyu Hu <qiyuh@google.com>
Cr-Commit-Position: refs/heads/master@{#572431}