Support Event 1.1 with Datetime field.

Bug: 266796373
Bug: 271386921
Tag: #feature
Test: atest BluetoothInstrumentationTests
(cherry picked from https://android-review.googlesource.com/q/commit:270565b07dbc3c86b2b8a14f94e37d2bcea3080a)
Merged-In: Ic8c66f8db004ff8245f139e9047091e2bf52657a
Bug: 263323082

Change-Id: I24d3293aa79387b5e0df1509d514c9cbbce57cde