etnaviv: etna_resource_copy_region(..): drop assert

We are using util_resource_copy_region(..) as fallback which supports
different formats for src and dst. Improves the experience when running
deqp or piglit with a debug build.

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Reviewed-by: Jonathan Marek <jonathan@marek.ca>

src/gallium/drivers/etnaviv/etnaviv_clear_blit.c

@@ -114,9 +114,6 @@ etna_resource_copy_region(struct pipe_context *pctx, struct pipe_resource *dst,
 {
    struct etna_context *ctx = etna_context(pctx);
 
-   /* The resource must be of the same format. */
-   assert(src->format == dst->format);
-
    /* XXX we can use the RS as a literal copy engine here
     * the only complexity is tiling; the size of the boxes needs to be aligned
     * to the tile size