rockchip: serial: rename U_BOOT_DRIVER name to rockchip_uart

When a defconfig for rk3288 is compiled it gives the warning:

rockchip_rk3288_uart: Missing .compatible in
                      ./drivers/serial/serial_rockchip.c
                    : WARNING: the driver rockchip_rk3288_uart
                      was not found in the driver list

Fix by renaming U_BOOT_DRIVER name of serial_rockchip.c
to rockchip_uart. Add rk3288 serial support with
a DM_DRIVER_ALIAS define.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/drivers/serial/serial_rockchip.c b/drivers/serial/serial_rockchip.c
index 10e731c..f4e9422 100644
--- a/drivers/serial/serial_rockchip.c
+++ b/drivers/serial/serial_rockchip.c
@@ -14,13 +14,13 @@
 
 struct rockchip_uart_plat {
 #if CONFIG_IS_ENABLED(OF_PLATDATA)
-	struct dtd_rockchip_rk3288_uart dtplat;
+	struct dtd_rockchip_uart dtplat;
 #endif
 	struct ns16550_plat plat;
 };
 
 #if CONFIG_IS_ENABLED(OF_PLATDATA)
-struct dtd_rockchip_rk3288_uart *dtplat, s_dtplat;
+struct dtd_rockchip_uart *dtplat, s_dtplat;
 #endif
 
 static int rockchip_serial_probe(struct udevice *dev)
@@ -41,8 +41,8 @@
 #endif
 }
 
-U_BOOT_DRIVER(rockchip_rk3288_uart) = {
-	.name		= "rockchip_rk3288_uart",
+U_BOOT_DRIVER(rockchip_uart) = {
+	.name		= "rockchip_uart",
 	.id		= UCLASS_SERIAL,
 	.priv_auto	= sizeof(struct ns16550),
 	.plat_auto	= sizeof(struct rockchip_uart_plat),
@@ -50,7 +50,8 @@
 	.ops		= &ns16550_serial_ops,
 	.flags		= DM_FLAG_PRE_RELOC,
 };
-DM_DRIVER_ALIAS(rockchip_rk3288_uart, rockchip_rk3066_uart)
-DM_DRIVER_ALIAS(rockchip_rk3288_uart, rockchip_rk3188_uart)
-DM_DRIVER_ALIAS(rockchip_rk3288_uart, rockchip_rk3328_uart)
-DM_DRIVER_ALIAS(rockchip_rk3288_uart, rockchip_rk3368_uart)
+DM_DRIVER_ALIAS(rockchip_uart, rockchip_rk3066_uart)
+DM_DRIVER_ALIAS(rockchip_uart, rockchip_rk3188_uart)
+DM_DRIVER_ALIAS(rockchip_uart, rockchip_rk3288_uart)
+DM_DRIVER_ALIAS(rockchip_uart, rockchip_rk3328_uart)
+DM_DRIVER_ALIAS(rockchip_uart, rockchip_rk3368_uart)