freedreno: Start moving relocs flags into the BOs.

freedreno: Start moving relocs flags into the BOs.

It's silly to have all the reloc emitters passing around FD_RELOC_READ
when you have to have it set on all relocs (that don't include WRITE,
which implies read) for the kernel to actually track the fences on the BO.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4967>