dwc3: Add ipc debug log for USB GSI and USB endpoint operation

There are some of issue reported where USB controller is accessing
0x00 which may happen when different commands are colliding to
configure USB controller and USB GSI wrapper. This change captures
USB GSI and USB endpoint operation specifically end transfer.

Change-Id: Ie4d428596e9c8200258ce95e95dd587dd943c2d2
Signed-off-by: Mayank Rana <mrana@codeaurora.org>