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/spi/zynqmp_gqspi.c b/drivers/spi/zynqmp_gqspi.c
index f09c507..c9e476e 100644
--- a/drivers/spi/zynqmp_gqspi.c
+++ b/drivers/spi/zynqmp_gqspi.c
@@ -177,7 +177,7 @@
 
 static int zynqmp_qspi_of_to_plat(struct udevice *bus)
 {
-	struct zynqmp_qspi_plat *plat = bus->plat;
+	struct zynqmp_qspi_plat *plat = dev_get_plat(bus);
 
 	debug("%s\n", __func__);
 
@@ -255,7 +255,7 @@
 
 void zynqmp_qspi_set_tapdelay(struct udevice *bus, u32 baudrateval)
 {
-	struct zynqmp_qspi_plat *plat = bus->plat;
+	struct zynqmp_qspi_plat *plat = dev_get_plat(bus);
 	struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
 	struct zynqmp_qspi_regs *regs = priv->regs;
 	u32 tapdlybypass = 0, lpbkdlyadj = 0, datadlyadj = 0, clk_rate;
@@ -295,7 +295,7 @@
 
 static int zynqmp_qspi_set_speed(struct udevice *bus, uint speed)
 {
-	struct zynqmp_qspi_plat *plat = bus->plat;
+	struct zynqmp_qspi_plat *plat = dev_get_plat(bus);
 	struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
 	struct zynqmp_qspi_regs *regs = priv->regs;
 	u32 confr;