DO NOT MERGE Drop Bluetooth connection with weak encryption key

This patch requires Bluetooth chip to support HCI Read Encryption Key Size
command and will cause Bluetooth to crash if this command is not supported
on a device. Such device should not take this patch and should look for
alternative solution to drop Bluetooth connection with weak encryption key.

Bug: 124301137
Merged-In: Id4b6b4e765628397a79e6806f45c2cd27acebd5b
Change-Id: Id4b6b4e765628397a79e6806f45c2cd27acebd5b