at86rf230: add missing cca ed level values
at86rf230: add missing cca ed level values

This patch add missing values for at86rf212 ed level values. Currently
there are 15 values and the register setting supports 16 different ed
level values.

Signed-off-by: Alexander Aring <d03dbcdedb9639e397df9b8578e8fc8274f4e6c4@gmail.com>
Reported-by: Craig Younkins <c4b5a8c0fafd56ae12499ba1d5d55022dbe4108e@freshtemp.com>
Signed-off-by: Marcel Holtmann <44592b4eea36663c86b994bb0ea99d15309c1c7d@holtmann.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs