Add MMC layout

Add support for eMMC layout. The actual update of the image will
be handled by the BMC updater since the image file will be
packaged in a single tarball, but the eMMC still needs to have
some services to setup the host firmware mounts for the virtual
pnor configuration to use. Therefore the functions are empty.

Change-Id: Iaa052342a2bb66e46ab7b59bdcd5631f3dfc2999
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
diff --git a/mmc/activation_mmc.hpp b/mmc/activation_mmc.hpp
new file mode 100644
index 0000000..68caf36
--- /dev/null
+++ b/mmc/activation_mmc.hpp
@@ -0,0 +1,32 @@
+#pragma once
+
+#include "activation.hpp"
+
+namespace openpower
+{
+namespace software
+{
+namespace updater
+{
+
+namespace fs = std::filesystem;
+
+/** @class ActivationMMC
+ *  @brief Implementation for eMMC PNOR layout
+ */
+class ActivationMMC : public Activation
+{
+  public:
+    using Activation::Activation;
+    ~ActivationMMC() = default;
+    Activations activation(Activations value) override;
+
+  private:
+    void unitStateChange(sdbusplus::message::message& msg) override;
+    void startActivation() override;
+    void finishActivation() override;
+};
+
+} // namespace updater
+} // namespace software
+} // namespace openpower