Refactor check for EFI system.

The TODO stands, to delegate this to KPMCore.

src/modules/partition/core/PartUtils.cpp

@@ -151,7 +151,7 @@ canBeResized( PartitionCoreModule* core, const QString& partitionPath )
 }
 
 
-FstabEntryList
+static FstabEntryList
 lookForFstabEntries( const QString& partitionPath )
 {
     FstabEntryList fstabEntries;
@@ -195,7 +195,7 @@ lookForFstabEntries( const QString& partitionPath )
 }
 
 
-QString
+static QString
 findPartitionPathForMountPoint( const FstabEntryList& fstab,
                                 const QString& mountPoint )
 {
@@ -328,4 +328,10 @@ runOsprober( PartitionCoreModule* core )
     return osproberEntries;
 }
 
+bool
+isEfiSystem()
+{
+    return QDir( "/sys/firmware/efi/efivars" ).exists();
+}
+
 }  // nmamespace PartUtils