usb: gadget: gsi: Improve notify_req handling

This change improves notify_req handling by removing existing state
machine used for queueing notify_req, and embed required type of
notify_request buffer while creating cpkt. It also makes sure not to
change notify_req buffer while it is queued with controller.

This change makes sure to queue any pending cpkt from gsi_resume()
once USB bus is resumed.

This change also starts logging important information of QTI packet
in read/write APIs and use qti_packet_debug module param to enable.

CRs-Fixed: 1070093
Change-Id: Ic4ae29583e6562eba768a97fa820954d15139064
Signed-off-by: Mayank Rana <mrana@codeaurora.org>