usb: gadget: f_qdss: Enable SG mode for qdss SW path

Current qdss driver supports BAM path and SW path.
To increase the throughput in SW path SG mode can be used.
This change enables scatter-gather mode for qdss function driver.

Change-Id: I2a2534649f7a358b667eaeb8c47900cf55411692
Signed-off-by: Pratham Pratap <prathampratap@codeaurora.org>