16550: 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: I5c2fe3b6a667acf80c808cfec4a64059a2c9c25f
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/plat/nvidia/tegra/soc/t194/plat_setup.c b/plat/nvidia/tegra/soc/t194/plat_setup.c
index 3640ade..7f2b00d 100644
--- a/plat/nvidia/tegra/soc/t194/plat_setup.c
+++ b/plat/nvidia/tegra/soc/t194/plat_setup.c
@@ -174,7 +174,7 @@
 			CONSOLE_FLAG_RUNTIME | CONSOLE_FLAG_CRASH);
 	}
 #else
-	static console_16550_t uart_console;
+	static console_t uart_console;
 
 	if ((id > 0) && (id < TEGRA194_MAX_UART_PORTS)) {
 		/*