Skip including the subtype PTR query for both announcement and offload
packets. This is necessary because devices like Googlecast have
numerous subtypes. Including these subtypes in the packets can easily
exceed the MTU limit. Furthermore, the Wi-Fi firmware has limited RAM
available for hardware offload, and including subtypes would consume
excessive memory resources needed for the offload code.
Test: TH
Flag: EXEMPT bug fix
Change-Id: I2575659983579da0bbf4ff104ba5b8111ee9585e
e41b66393c