dm: Use access methods for dev/uclass private data

Most drivers use these access methods but a few do not. Update them.

In some cases the access is not permitted, so mark those with a FIXME tag
for the maintainer to check.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Pratyush Yadav <p.yadav@ti.com>
diff --git a/drivers/net/xilinx_emaclite.c b/drivers/net/xilinx_emaclite.c
index 5c76887..6b44753 100644
--- a/drivers/net/xilinx_emaclite.c
+++ b/drivers/net/xilinx_emaclite.c
@@ -457,7 +457,7 @@
 {
 	u32 length, first_read, reg, attempt = 0;
 	void *addr, *ack;
-	struct xemaclite *emaclite = dev->priv;
+	struct xemaclite *emaclite = dev_get_priv(dev);
 	struct emaclite_regs *regs = emaclite->regs;
 	struct ethernet_hdr *eth;
 	struct ip_udp_hdr *ip;