[OE-core] [PATCH V2 1/1] rt-tests: bump version 0.87 => 0.89

[gary.robertson at linaro.org]

Thanks for the helpful comments as I am a relative newbie at patch submission
etiquette and procedures within the community.
In response to comments received from the mailing list, I have:
   - included contents from the initial cover letter into the patch header and
   - removed the obsoleted patch files from the recipe metadata.