Add dolphin for gamecube and wii.

nix/steam_deck/configuration/roles/dolphin/files/Dolphin.ini

@@ -0,0 +1,25 @@
+[Analytics]
+Enabled = False
+PermissionAsked = True
+[Core]
+GFXBackend = Vulkan
+# GFXBackend = OGL
+SlotA = 8 # GCI Folder (each game gets its own file)
+SlotB = 255 # None
+WiiSDCard = False
+[Display]
+RenderToMain = True
+[General]
+ISOPath0 = /home/deck/.persist/manual/games/nintendo_gamecube/roms
+ISOPath1 = /home/deck/.persist/manual/games/nintendo_wii/roms
+ISOPaths = 2
+RecursiveISOPaths = True
+[DSP]
+Backend = Cubeb
+# Backend = Pulse
+# Backend = ALSA
+[USBPassthrough]
+Devices = 057e:0305
+# BluetoothPassthrough must be at the end for the pairings to save properly
+[BluetoothPassthrough]
+Enabled = True