usb: dwc3: core: Add ipc logs when sg lists are used

Currently ipc_logging will capture the usb request's dma address but
when sg list is used usb request's dma address is not populated. This
change adds start_sg's dma address which is populated when sg list is
used for usb transfers. Also increase the number of log pages to capture
more ep events.

Change-Id: I36ada11429e168e2d3d09cf3427b1f3bcdacc285
Signed-off-by: Pratham Pratap <prathampratap@codeaurora.org>