syscfg: Always use full repo name in syscfg.h defs

CI builds have either mynewt-core or mynewt-nimble used as local
repository so the repo name is omitted in syscfg.h package defs. This
causes build issues since defines do not match those generated in
generic configuration, i.e. local project is used as local repo.

To avoid issues in future we'll always use full repo name for defs in
syscfg.h, this way those are stable regardless of repo location.

Note: repository name for local repo is the project name and it
overrides repository.yml name, if any.

newt/syscfg/syscfg.go

@@ -1592,7 +1592,7 @@ func sanitizePkgName(name string) string {
 func writePackages(lpkgs []*pkg.LocalPackage, w io.Writer) {
 	pkgs := []string{}
 	for _, lpkg := range lpkgs {
-		pkgs = append(pkgs, sanitizePkgName(lpkg.FullName()))
+		pkgs = append(pkgs, sanitizePkgName(lpkg.NameWithRepo()))
 	}
 
 	sort.Strings(pkgs)