usb_bam: Inject descriptor with EOT set if sps pipe is not empty

Currently USB driver is checking whether sps pipe for IPA consumer
is empty for 10msec and if it is not drained within timeout, going
ahead disconnecting IPA consumer pipe. IPA core won't ack to IPA BAM
if last descriptor before cable disconnect doesn't have EOT. This leads
to NOC error at IPA core level if goes ahead with disconnecting pipes
without sps pipe is drained. Hence inject descriptor with EOT set
to resolve the issue.

Change-Id: If0d7717137ce0d191299dc154b2321e1be1d1356
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>