usb: chipidea: tracing: Use the new __vstring() helper

Instead of open coding a __dynamic_array() with a fixed length (which
defeats the purpose of the dynamic array in the first place). Use the new
__vstring() helper that will use a va_list and only write enough of the
string into the ring buffer that is needed.

Link: https://lkml.kernel.org/r/20220705224749.991587733@goodmis.org

Cc: Peter Chen <peter.chen@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-usb@vger.kernel.org
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

usb: chipidea: trace: fix the endian issue

"sparse warnings: (new ones prefixed by >>)"
drivers/usb/chipidea/trace.c: note: in included file (through include/trace/trace_events.h, include/trace/define_trace.h, drivers/usb/chipidea/trace.h):
>> drivers/usb/chipidea/./trace.h:39:1: sparse: sparse: incorrect type in assignment (different base types) @@ expected unsigned int [usertype] next @@ got restricted __le32 [usertype] next @@
>> drivers/usb/chipidea/./trace.h:39:1: sparse: expected unsigned int [usertype] next
>> drivers/usb/chipidea/./trace.h:39:1: sparse: got restricted __le32 [usertype] next
>> drivers/usb/chipidea/./trace.h:39:1: sparse: sparse: incorrect type in assignment (different base types) @@ expected unsigned int [usertype] token @@ got restricted __le32 [usertype] token @@
>> drivers/usb/chipidea/./trace.h:39:1: sparse: expected unsigned int [usertype] token
>> drivers/usb/chipidea/./trace.h:39:1: sparse: got restricted __le32 [usertype] token
drivers/usb/chipidea/trace.c: note: in included file (through include/trace/perf.h, include/trace/define_trace.h, drivers/usb/chipidea/trace.h):
>> drivers/usb/chipidea/./trace.h:39:1: sparse: sparse: incorrect type in assignment (different base types) @@ expected unsigned int [usertype] next @@ got restricted __le32 [usertype] next @@
>> drivers/usb/chipidea/./trace.h:39:1: sparse: expected unsigned int [usertype] next
>> drivers/usb/chipidea/./trace.h:39:1: sparse: got restricted __le32 [usertype] next
>> drivers/usb/chipidea/./trace.h:39:1: sparse: sparse: incorrect type in assignment (different base types) @@ expected unsigned int [usertype] token @@ got restricted __le32 [usertype] token @@
>> drivers/usb/chipidea/./trace.h:39:1: sparse: expected unsigned int [usertype] token
>> drivers/usb/chipidea/./trace.h:39:1: sparse: got restricted __le32 [usertype] token

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Peter Chen <peter.chen@nxp.com>

usb: chipidea: add tracepoint support for udc

Add basic tracepoint support for udc driver.

Reviewed-by: Jun Li <jun.li@nxp.com>
Signed-off-by: Peter Chen <peter.chen@nxp.com>