Revert "hci: Remove SimultaneousLeHost bit"

This reverts commit 66e6e21a.

The SimultaneousLeHost bit was deprecated in version 4.1 of the
spec, but some Bluetooth chips still need it to be set.

Bug: 179958088
Test: atest bluetooth_test_gd
      observe LMP features on a Pixel 3 when using GD controller
Tag: #gd-refactor
Change-Id: Ie8f8a8c9322a6301388ba9415d998e218ef008b1