LICENSES: Add CDDL-1.0 license text

Add the full text of the CDDL-1.0 to the kernel tree.  It was copied directly
from:

   https://spdx.org/licenses/CDDL-1.0.html#licenseTextSigned-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>