Skip EATT connect for LL version < BT 5.0

Follow-on change to skip EATT connect for BT LL version < 5.0 instead of
<5.2, since EATT is software feature. Also address nit from previous
patch.

Bug: 284511042
Test: m com.android.btservices | Manual: Ensure EATT doesn't connect
when LL version reported <5, and does connect when 5 or greater.

Change-Id: Ia252310df932d1e62ff66a4c1407dd299852de4b