McuSupport: Fix some warnings

Change-Id: I641a31ed18bb804ffe081852dcfb39499f24c30f
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/mcusupport/mcusupportoptions.h

@@ -200,8 +200,9 @@ private:
     int m_colorDepth = -1;
 };
 
-struct McuSdkRepository
+class McuSdkRepository
 {
+public:
     QVector<McuPackage*> packages;
     QVector<McuTarget*> mcuTargets;
 

src/plugins/mcusupport/mcusupportsdk.h

@@ -37,7 +37,7 @@ namespace Internal {
 #define MAX_COMPATIBILITY_VERSION 1
 
 class McuSdkRepository;
-class McuToolChainPackage;
+class McuPackage;
 namespace Sdk {
 
 McuPackage *createQtForMCUsPackage();