updated reference to hsa with roc
updated reference to hsa with roc

seibert/numba,IntelLabs/numba,stuartarchibald/numba,numba/numba,stonebig/numba,IntelLabs/numba,numba/numba,gmarkall/numba,stuartarchibald/numba,numba/numba,stuartarchibald/numba,stonebig/numba,stonebig/numba,seibert/numba,cpcloud/numba,gmarkall/numba,cpcloud/numba,cpcloud/numba,stonebig/numba,seibert/numba,IntelLabs/numba,stonebig/numba,numba/numba,IntelLabs/numba,stuartarchibald/numba,cpcloud/numba,seibert/numba,cpcloud/numba,stuartarchibald/numba,gmarkall/numba,gmarkall/numba,numba/numba,gmarkall/numba,seibert/numba,IntelLabs/numba