Revert "gs101: usb: add state of usb extcon to monitorffs"

This reverts commit 72ef08cafa11ab10bc31105c70836cef92e1f7b4.

Reason for revert: using alternate method for original behavior change
Bug: 187261232
Test: build pass

Change-Id: I5643a4109f6e4a64d167ed9ee1ce0bc3492cea42
diff --git a/usb/UsbGadget.h b/usb/UsbGadget.h
index e3eb3b4..2669f8d 100644
--- a/usb/UsbGadget.h
+++ b/usb/UsbGadget.h
@@ -74,8 +74,7 @@
 #ifndef UDC_PATH
 #define UDC_PATH "/sys/class/udc/11110000.dwc3/"
 #endif
-constexpr char kExtconUsbState[] = "/sys/class/extcon/extcon0/cable.0/state";
-static MonitorFfs monitorFfs(kGadgetName, kExtconUsbState);
+static MonitorFfs monitorFfs(kGadgetName);
 
 #define SPEED_PATH UDC_PATH "current_speed"