feat(intel): add macro to switch between different UART PORT

HSD #1509626040:
This patch is to add the flexibility for BL2 and BL31
to choose different UART output port at platform_def.h
using parameter PLAT_INTEL_UART_BASE

This patch also fixing the plat_helpers.S where the
UART BASE is hardcoded to PLAT_UART0_BASE. It is then
switched to CRASH_CONSOLE_BASE.

Signed-off-by: Boon Khai Ng <boon.khai.ng@intel.com>
Change-Id: Iccfa7ec64e4955b531905778be4da803045d3c8f
diff --git a/plat/intel/soc/stratix10/bl2_plat_setup.c b/plat/intel/soc/stratix10/bl2_plat_setup.c
index a8026ea..faff898 100644
--- a/plat/intel/soc/stratix10/bl2_plat_setup.c
+++ b/plat/intel/soc/stratix10/bl2_plat_setup.c
@@ -69,8 +69,8 @@
 
 	watchdog_init(get_wdt_clk());
 
-	console_16550_register(PLAT_UART0_BASE, get_uart_clk(), PLAT_BAUDRATE,
-		&console);
+	console_16550_register(PLAT_INTEL_UART_BASE, get_uart_clk(),
+		PLAT_BAUDRATE, &console);
 
 	socfpga_emac_init();
 	socfpga_delay_timer_init();