usb: chipidea: remove home-grown tracing facility

As part of the legacy from the original driver design, we retain home-grown
tracing infrastructure, complete with own ring buffer and timestamps,
which among other things has a performance penalty. This patch removes it.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --cc drivers/usb/chipidea/debug.c
Simple merge

diff --cc drivers/usb/chipidea/debug.h
Simple merge

diff --cc drivers/usb/chipidea/udc.c
Simple merge