usb: dwc3: gadget: improve several ipc log

add gadget speed to 'BUS RESET' log, then 'UDC RESET' can be removed,
add link speed to 'CONNECT DONE' log,
add link state to 'SUSPEND INT' log,
show ep0 state when pullup during non setup phase.

Change-Id: I12c4f69796b09f0dce90ea88513a9653e7641df9
Signed-off-by: Linyu Yuan <linyyuan@codeaurora.org>