freedreno/a6xx: Don't blit with R2D_RAW
Map all formats to a valid ifmt.
Fixes dEQP-GLES31.functional.draw_buffers_indexed.random.max_implementation_draw_buffers.* with FD_MESA_DEBUG=nogmem as well as hangs on gfxbench carchase (sysmem clear hang because tessellation).
Edited by Kristian H. Kristensen