[yocto] defunct cedartrail BSP still mentioned in ref manual

[Robert P. J. Day]

  while intel's cedartrail BSP was removed back in 2013, it's still
used as an example in the explanation of the KMACHINE variable in the
variable glossary:

http://www.yoctoproject.org/docs/latest/ref-manual/ref-manual.html#var-KMACHINE

someone might want to swap in a current example for that.

rday

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Robert P. J. Day                                 Ottawa, Ontario, CANADA
                        http://crashcourse.ca

Twitter:                                       http://twitter.com/rpjday
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