radv: partial sdma support

SDMA code adapted from https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12763

The only supported use case is image (linear or tiled) -> buffer and only GFX9+ is
supported (for now).

Since RADV_QUEUE_TRANSFER aren't exposed to applications, this cannot be used,
except by the driver.

Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13959>

src/amd/vulkan/radv_debug.h

@@ -64,6 +64,7 @@ enum {
    RADV_DEBUG_NO_ATOC_DITHERING = 1ull << 33,
    RADV_DEBUG_NO_NGGC = 1ull << 34,
    RADV_DEBUG_DUMP_PROLOGS = 1ull << 35,
+   RADV_DEBUG_NO_DMA_BLIT = 1ull << 36,
 };
 
 enum {