UPSTREAM: usb: dwc3: core: Add error log when core soft reset failed

DWC3 controller soft reset is important operation for USB functionality.
In case when it fails, currently there is no failure log. Hence add
error log when core soft reset failed.

Signed-off-by: Mayank Rana <quic_mrana@quicinc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Bug: 235863377
(cherry picked from commit 859bdc35)
Change-Id: I60500f66af47d93cf9d60bdecab32e6dc48d4b7c
Signed-off-by: Mayank Rana <quic_mrana@quicinc.com>