Is using the description of an award as-is in a CV considered plagiarism?
Definitely not.

Plagiarism is the use, in an academic, creative or intellectual context, of someone else's ideas or distinctive language, without proper attribution.  It follows from this that in some forms of writing it is not possible to plagiarize: for instance, you cannot plagiarize in a lease or customer service agreement or in wedding thank you cards.   

A CV is an academic document, but it is not the kind of academic document having a blanket premise of originality in regard to its writing.  For instance, the formatting of a CV is usually taken from someone else's template...and that's completely okay because no one is expecting your CV to be formatted in a new, original way -- on the contrary, the formatting of a CV should largely conform to agreed upon academic cultural norms.  

There is some small amount of room for "creative writing" in a CV, but it does not lie in the description of awards you've won.  Anyone reading your CV would expect that you have attempted to describe the awards in a very standard way.  If that means copying the official text of the awards: no problem at all.