[FEA] make_tma_copy doesnot support shared-to-shared copy

[ziyuhuang123]

Describe the bug In PTX, I noticed that

cp.async.bulk.dst.src.completion_mechanism [dstMem], [srcMem], size, [mbar]

.dst =                  { .shared::cluster }
.src =                  { .shared::cta }
.completion_mechanism = { .mbarrier::complete_tx::bytes }

supports shared-to-shared copy. But in cute, make_tma_copy has to be global to shared. Why? Could you modify it?