lib: Add atmel same51 and same54 build definitions

This also replaces the samd51 component files with the definitions
from the same54 repository.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

lib/same51/include/sam.h

@@ -0,0 +1,52 @@
+/**
+ * \file
+ *
+ * \brief Top level header file
+ *
+ * Copyright (c) 2019 Microchip Technology Inc.
+ *
+ * \license_start
+ *
+ * \page License
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * \license_stop
+ *
+ */
+
+#ifndef _SAM_
+#define _SAM_
+
+#if   defined(__SAME51G19A__) || defined(__ATSAME51G19A__)
+  #include "same51g19a.h"
+#elif defined(__SAME51G18A__) || defined(__ATSAME51G18A__)
+  #include "same51g18a.h"
+#elif defined(__SAME51N20A__) || defined(__ATSAME51N20A__)
+  #include "same51n20a.h"
+#elif defined(__SAME51N19A__) || defined(__ATSAME51N19A__)
+  #include "same51n19a.h"
+#elif defined(__SAME51J19A__) || defined(__ATSAME51J19A__)
+  #include "same51j19a.h"
+#elif defined(__SAME51J18A__) || defined(__ATSAME51J18A__)
+  #include "same51j18a.h"
+#elif defined(__SAME51J20A__) || defined(__ATSAME51J20A__)
+  #include "same51j20a.h"
+#else
+  #error Library does not support the specified device
+#endif
+
+#endif /* _SAM_ */
+