drm/armada: Delete dma_buf->k(un)map implemenation

It's a dummy anyway.
Acked-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Russell King <linux@armlinux.org.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20191118103536.17675-6-daniel.vetter@ffwll.ch

drivers/gpu/drm/armada/armada_gem.c

@@ -461,16 +461,6 @@ static void armada_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
 	kfree(sgt);
 }
 
-static void *armada_gem_dmabuf_no_kmap(struct dma_buf *buf, unsigned long n)
-{
-	return NULL;
-}
-
-static void
-armada_gem_dmabuf_no_kunmap(struct dma_buf *buf, unsigned long n, void *addr)
-{
-}
-
 static int
 armada_gem_dmabuf_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
 {
@@ -481,8 +471,6 @@ static const struct dma_buf_ops armada_gem_prime_dmabuf_ops = {
 	.map_dma_buf	= armada_gem_prime_map_dma_buf,
 	.unmap_dma_buf	= armada_gem_prime_unmap_dma_buf,
 	.release	= drm_gem_dmabuf_release,
-	.map		= armada_gem_dmabuf_no_kmap,
-	.unmap		= armada_gem_dmabuf_no_kunmap,
 	.mmap		= armada_gem_dmabuf_mmap,
 };