adb: extract soon-to-be-common code.

As a side effect, delete FDE_ACTIVE, which was always set on every
fdevent, and FDE_PENDING, which was an internal implementation detail.

This patch removes spin detection, which will be reimplemented
separately later.

Test: adb_test on host
Test: adbd_test on blueline
Change-Id: I40be3504ce03c4fae5e071fa018542a051b7511d