SYCL port

Development is in the sycl branch https://github.com/lattice/quda/tree/feature/sycl

Changes from develop can be seen in the PR https://github.com/lattice/quda/pull/1168

Outstanding changes/issues

• BlockReduce calls simplified to make it easier to implement in SYCL
• reducer_t types added for reductions (reducer.h, transform_reduce.cuh)
• multi blas Args may not fit in max_kernel_arg_size (using max_constant_size instead)
• quda_target.h needs to be included from quda_internal.h
• block size in dslash_coarse kernel must evenly divide threads
• FAST_COMPILE_REDUCE version of block_orthogonalize.cu and restrictor.cu can't go larger than max_block_size