Floss: Avoid LE connection for classic devices

Open a GATT client creates an LE connection with peer, if this happens
in the pairing process with an classic keyboard with wrong passkey,
the bluetooth controller might not be reset or not be able to connect
with other peer devices. This patch avoids to connect/disconnect to
battery service for classic devices.

Bug: 258283982
Tag: #floss
Test: Manual - Pair CL keyboard with wrong key and then pair with LE mouse
Change-Id: I8d7e94058bda2a0f840f090f15d33b6a32fb2181