rockchip: Clean up header and referenced files

So far, there are more and more features are supported on the RK3399,
meanwhile, these features are increasingly being defined and intertwined.
It's time to clean up and make them clearer.

Signed-off-by: Xing Zheng <zhengxing@rock-chips.com>
diff --git a/plat/rockchip/rk3399/include/platform_def.h b/plat/rockchip/rk3399/include/platform_def.h
index 5ccc532..6fb9d98 100644
--- a/plat/rockchip/rk3399/include/platform_def.h
+++ b/plat/rockchip/rk3399/include/platform_def.h
@@ -138,7 +138,7 @@
 #define PLAT_RK_G1S_IRQS		RK3399_G1S_IRQS
 #define PLAT_RK_G0_IRQS			RK3399_G0_IRQS
 
-#define PLAT_RK_UART_BASE		RK3399_UART2_BASE
+#define PLAT_RK_UART_BASE		UART2_BASE
 #define PLAT_RK_UART_CLOCK		RK3399_UART_CLOCK
 #define PLAT_RK_UART_BAUDRATE		RK3399_BAUDRATE