Bluetooth: MGMT: Fix not checking if BT_HS is enabled

This checks if BT_HS is enabled relecting it on MGMT_SETTING_HS instead
of always reporting it as supported.

From https://lore.kernel.org/linux-bluetooth/20200806181714.3216076-4-luiz.dentz@gmail.com/
By Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

Change-Id: I8a622e760317ee0ae3e669911b0950e274f2859f