FROMGIT: usb: dwc3: Add trace event for dwc3_set_prtcap

Changes to the port capability can be indirectly observed by tracing
register writes to DWC3_GCTL. However, this requires interpreting the
raw value, which is neither intuitive nor precise for debugging.
Monitoring these mode changes is essential for resolving issues related
to USB role switching and enumeration.

Introduce a dedicated trace event to provide a human-readable log when
the port capability is configured.

Signed-off-by: Kuen-Han Tsai <khtsai@google.com>
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/20250822092411.173519-1-khtsai@google.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

(cherry picked from commit 55f4ac8f https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git

 usb-next)

Bug: 427760780
Change-Id: I2ccfcf321fc2ae70b1ff0f4e4fbf6cbc6ac5c1e4
Signed-off-by: Kuen-Han Tsai <khtsai@google.com>