[docs] Add rawspeed to test-suite proposals.

rawspeed was suggested by Simon Pilgrim and Roman Lebedev in
llvm.org/PR34216 and reviews.llvm.org/D46714.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@345166 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed