Merge "logd: allow opting into simple or serialized log buffers" am:...

Merge "logd: allow opting into simple or serialized log buffers" am: ed99870f am: c89430bd am: fbac065c am: 25b492c3

Original change: https://android-review.googlesource.com/c/platform/system/core/+/1362341

Change-Id: I014d645406827d368ab033badd8c1990d74313d9