refactor(imx8m): replace UART base magic numbers with macros

This patch replaces the magic numbers of the UART base addresses with
the corresponding macros defined in the appropriate platform file.

Change-Id: Ie6a4555a659e9f722a8d819958ad9a2dee7c3aa0
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
diff --git a/plat/imx/imx8m/imx8m_ccm.c b/plat/imx/imx8m/imx8m_ccm.c
index 10a00c9..6b14446 100644
--- a/plat/imx/imx8m/imx8m_ccm.c
+++ b/plat/imx/imx8m/imx8m_ccm.c
@@ -17,16 +17,16 @@
 } imx8m_uart_info[] = {
 	{	/* UART 1 */
 		.ccm_reg = 0x4490,
-		.uart_base = 0x30860000,
+		.uart_base = IMX_UART1_BASE,
 	}, {	/* UART 2 */
 		.ccm_reg = 0x44a0,
-		.uart_base = 0x30890000,
+		.uart_base = IMX_UART2_BASE,
 	}, {	/* UART 3 */
 		.ccm_reg = 0x44b0,
-		.uart_base = 0x30880000,
+		.uart_base = IMX_UART3_BASE,
 	}, {	/* UART 4 */
 		.ccm_reg = 0x44c0,
-		.uart_base = 0x30a60000,
+		.uart_base = IMX_UART4_BASE,
 	}
 };