Add initial support for eMMC layout

Initial commit to add an mmc layout option to update eMMC chips.

Tested: Compiled with each of the three supported options:
        'meson build -Dbmc-layout=<option>' and verified a build/<option>
        subdir was created.

Change-Id: Idfc9c7f0380daff2d865663dacba23c919386d4f
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
diff --git a/mmc/item_updater_helper.cpp b/mmc/item_updater_helper.cpp
new file mode 100644
index 0000000..8ef5749
--- /dev/null
+++ b/mmc/item_updater_helper.cpp
@@ -0,0 +1,47 @@
+#include "item_updater_helper.hpp"
+
+namespace phosphor
+{
+namespace software
+{
+namespace updater
+{
+
+void Helper::setEntry(const std::string& /* entryId */, uint8_t /* value */)
+{
+    // Empty
+}
+
+void Helper::clearEntry(const std::string& /* entryId */)
+{
+    // Empty
+}
+
+void Helper::cleanup()
+{
+    // Empty
+}
+
+void Helper::factoryReset()
+{
+    // Empty
+}
+
+void Helper::removeVersion(const std::string& /* versionId */)
+{
+    // Empty
+}
+
+void Helper::updateUbootVersionId(const std::string& /* versionId */)
+{
+    // Empty
+}
+
+void Helper::mirrorAlt()
+{
+    // Empty
+}
+
+} // namespace updater
+} // namespace software
+} // namespace phosphor