[feat] Add Android clipboard definition (#3479)

References https://github.com/koreader/koreader/issues/3441

frontend/device/android/device.lua

@@ -14,6 +14,7 @@ local Device = Generic:new{
     hasFrontlight = yes,
     firmware_rev = "none",
     display_dpi = android.lib.AConfiguration_getDensity(android.app.config),
+    hasClipboard = yes,
     hasColorScreen = yes,
 }
 
@@ -33,6 +34,15 @@ function Device:init()
                 this.device.screen:refreshFull()
             end
         end,
+        hasClipboardText = function()
+            return android.hasClipboardText()
+        end,
+        getClipboardText = function()
+            return android.getClipboardText()
+        end,
+        setClipboardText = function(text)
+            return android.setClipboardText(text)
+        end,
     }
 
     -- check if we have a keyboard