ANDROID: GKI: defconfig: Enable USB xHCI sideband configuration

To enable USB audio offloading, the xHCI sideband driver is required, as
it maintains and communicates endpoint information to the USB offload
vendor drivers.

Bug: 392112015
Change-Id: Iaa4ff7b56e57e4ace4186df91c746b252dd912d9
Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
(cherry picked from commit 0bee1c82)
[qsliu@google.com: Enable for x86 as well]
Signed-off-by: Jacky Liu <qsliu@google.com>