commonlib/clamp.h: Relicense file to be BSD-compatible

I added this header in commit a6c8b4becbd12fe6043557ca1e398c1a7c691007
(nb/intel/sandybridge: Rewrite get_FRQ). Relicense it as "BSD-3-Clause
OR GPL-2.0-or-later" and move it into the BSD-licensed commonlib part.

Change-Id: I89ebdcdf8d06e78e624e37a443696981b3b17b7d
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66711
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/commonlib/include/commonlib/clamp.h b/src/commonlib/bsd/include/commonlib/bsd/clamp.h
similarity index 61%
rename from src/commonlib/include/commonlib/clamp.h
rename to src/commonlib/bsd/include/commonlib/bsd/clamp.h
index e01a107..66513b0 100644
--- a/src/commonlib/include/commonlib/clamp.h
+++ b/src/commonlib/bsd/include/commonlib/bsd/clamp.h
@@ -1,7 +1,7 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
+/* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0-or-later */
 
-#ifndef COMMONLIB_CLAMP_H
-#define COMMONLIB_CLAMP_H
+#ifndef COMMONLIB_BSD_CLAMP_H
+#define COMMONLIB_BSD_CLAMP_H
 
 #include <stdint.h>
 
@@ -19,4 +19,4 @@
 	return val;
 }
 
-#endif /* COMMONLIB_CLAMP_H */
+#endif /* COMMONLIB_BSD_CLAMP_H */
diff --git a/src/northbridge/intel/sandybridge/raminit_native.c b/src/northbridge/intel/sandybridge/raminit_native.c
index ca26628..7141116 100644
--- a/src/northbridge/intel/sandybridge/raminit_native.c
+++ b/src/northbridge/intel/sandybridge/raminit_native.c
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
-#include <commonlib/clamp.h>
+#include <commonlib/bsd/clamp.h>
 #include <console/console.h>
 #include <console/usb.h>
 #include <cpu/intel/model_206ax/model_206ax.h>