Link attribute reads to Content Apps, refactor content app platform to leverage latest cluster lib conventions

src/controller/CommissionerDiscoveryController.cpp

@@ -31,6 +31,8 @@
 #include <controller/CommissionerDiscoveryController.h>
 #include <platform/CHIPDeviceLayer.h>
 
+#if CHIP_DEVICE_CONFIG_ENABLE_COMMISSIONER_DISCOVERY
+
 using namespace ::chip;
 using namespace chip::Protocols::UserDirectedCommissioning;
 
@@ -157,3 +159,4 @@ void CommissionerDiscoveryController::Cancel()
     mPendingConsent = false;
     return;
 }
+#endif // CHIP_DEVICE_CONFIG_ENABLE_COMMISSIONER_DISCOVERY

src/controller/CommissionerDiscoveryController.h

@@ -35,6 +35,8 @@
 #include <platform/CHIPDeviceLayer.h>
 #include <protocols/user_directed_commissioning/UserDirectedCommissioning.h>
 
+#if CHIP_DEVICE_CONFIG_ENABLE_COMMISSIONER_DISCOVERY
+
 using chip::Protocols::UserDirectedCommissioning::UDCClientState;
 using chip::Protocols::UserDirectedCommissioning::UserConfirmationProvider;
 using chip::Protocols::UserDirectedCommissioning::UserDirectedCommissioningServer;
@@ -180,3 +182,5 @@ class CommissionerDiscoveryController : public chip::Protocols::UserDirectedComm
     PincodeService * mPincodeService             = nullptr;
     CommissionerCallback * mCommissionerCallback = nullptr;
 };
+
+#endif // CHIP_DEVICE_CONFIG_ENABLE_COMMISSIONER_DISCOVERY