Remove Out Endpoint Descriptors from Absolute Mouse and Relative Mouse (#542)

* Update hid_mouse_absolute.go

Added attribute to remove unnecessary out endpoint.

* Update hid_mouse_relative.go

Added attribute to remove unnecessary out endpoint.

* Update hid_keyboard.go

Added attribute to explicitly keep currently needed out endpoint and to make listed attributes consistent across the keyboard and mouse devices.

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Co-authored-by: Aveline <352441+ym@users.noreply.github.com>

internal/usbgadget/hid_keyboard.go

@@ -17,6 +17,7 @@ var keyboardConfig = gadgetConfigItem{
 		"protocol":        "1",
 		"subclass":        "1",
 		"report_length":   "8",
+		"no_out_endpoint": "0",		
 	},
 	reportDesc: keyboardReportDesc,
 }

internal/usbgadget/hid_mouse_absolute.go

@@ -14,6 +14,7 @@ var absoluteMouseConfig = gadgetConfigItem{
 		"protocol":        "2",
 		"subclass":        "0",
 		"report_length":   "6",
+		"no_out_endpoint": "1",
 	},
 	reportDesc: absoluteMouseCombinedReportDesc,
 }

internal/usbgadget/hid_mouse_relative.go

@@ -14,6 +14,7 @@ var relativeMouseConfig = gadgetConfigItem{
 		"protocol":        "2",
 		"subclass":        "1",
 		"report_length":   "4",
+		"no_out_endpoint": "1",
 	},
 	reportDesc: relativeMouseCombinedReportDesc,
 }