[DEFCONFIG][USB_MON] Enable USB Monitor

- the usb monitor is useful to collect traces of I/O on the USB bus.
- Step to use it:
  1) find the usb bus that you want to analyze (eg: 1)
  2) check that under /sys/kernel/debug/usb/usbmon/ there are some files that start with the number of this bus (1s, 1t, 1u)
  3.a) analyze the traffic with the cat of  /sys/kernel/debug/usb/usbmon/1u (not easy to understand the content)
  3.b) collect the traffic with tcpdump (eg: tcpdump -i usbmon1 -s0 -w usb1.pcap) and then use wireshark to analyze the content of the file

arch/arm64/configs/seco_imx8_linux_defconfig

@@ -995,6 +995,7 @@ CONFIG_DEBUG_INFO=y
 CONFIG_MAGIC_SYSRQ=y
 CONFIG_DEBUG_FS=y
 CONFIG_DEBUG_KERNEL=y
+CONFIG_USB_MON=y
 # CONFIG_SCHED_DEBUG is not set
 # CONFIG_DEBUG_PREEMPT is not set
 # CONFIG_FTRACE is not set