pl011: 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: I7a23327394d142af4b293ea7ccd90b843c54587c
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/plat/hisilicon/hikey/hikey_bl31_setup.c b/plat/hisilicon/hikey/hikey_bl31_setup.c
index 0326e9f..7d008e7 100644
--- a/plat/hisilicon/hikey/hikey_bl31_setup.c
+++ b/plat/hisilicon/hikey/hikey_bl31_setup.c
@@ -27,7 +27,7 @@
 
 static entry_point_info_t bl32_ep_info;
 static entry_point_info_t bl33_ep_info;
-static console_pl011_t console;
+static console_t console;
 
 /******************************************************************************
  * On a GICv2 system, the Group 1 secure interrupts are treated as Group 0