AdapterState: Set BLE start timeout to 4 seconds

Some devices need more than two seconds to initialize the
transport, download firmware, and update.

Fixes: 79369424
Test: runtest bluetooth
Change-Id: Ib1d58a32f721b50385f0959f42e7829ef8c92454
(cherry picked from commit 3c745fe42c776e7c58cfc56901ef6dc0b32c99e8)