imx: Use generic console_t data structure

Since now the generic console_t structure holds the UART base address as
well, let's use that generic location and drop the UART driver specific
data structure at all.

Change-Id: I058f793e4024fa7291e432f5be374a77faf16f36
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/plat/imx/imx8qx/imx8qx_bl31_setup.c b/plat/imx/imx8qx/imx8qx_bl31_setup.c
index 58c82ce..97d2227 100644
--- a/plat/imx/imx8qx/imx8qx_bl31_setup.c
+++ b/plat/imx/imx8qx/imx8qx_bl31_setup.c
@@ -255,7 +255,7 @@
 				u_register_t arg2, u_register_t arg3)
 {
 #if DEBUG_CONSOLE
-	static console_lpuart_t console;
+	static console_t console;
 #endif
 	if (sc_ipc_open(&ipc_handle, SC_IPC_BASE) != SC_ERR_NONE)
 		panic();