[partition] Remove unused addEntry method

- The method addEntry with PartitionEntry appears to be unused since its
  always. Drop it!

src/modules/partition/core/PartitionLayout.cpp

@@ -62,20 +62,6 @@ PartitionLayout::PartitionLayout( const PartitionLayout& layout )
 
 PartitionLayout::~PartitionLayout() {}
 
-bool
-PartitionLayout::addEntry( PartitionLayout::PartitionEntry entry )
-{
-    if ( !entry.isValid() )
-    {
-        cError() << "Partition size is invalid or has min size > max size";
-        return false;
-    }
-
-    m_partLayout.append( entry );
-
-    return true;
-}
-
 PartitionLayout::PartitionEntry::PartitionEntry()
     : partAttributes( 0 )
 {

src/modules/partition/core/PartitionLayout.h

@@ -63,7 +63,6 @@ public:
     PartitionLayout( const PartitionLayout& layout );
     ~PartitionLayout();
 
-    bool addEntry( PartitionEntry entry );
     bool addEntry( const QString& mountPoint,
                    const QString& size,
                    const QString& min = QString(),