floss: Require ble privacy flag for resolving list

Currently, the `supports_ble_privacy` flag is only used to set the
privacy mode. However, this feature flag also affects whether the
resolving list can be used and should be protected by the same flag.

Bug: 253510389
Tag: #floss
Test: Run ChromeOS tests + verify resolving list not used.
Change-Id: Iae57bbb2874fab9b53f6df8d5598feeaa7c405ff