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Use the console_pl011_core_* functions directly in the crash console
callbacks.

This bypasses the MULTI_CONSOLE_API for the crash console (UART1), but
allows using the crash console before the C runtime has been initialized
(eg to call ASM_ASSERT). This retains backwards compatibility with respect
to functionality when the old API is used.

Use the MULTI_CONSOLE_API to register UART0 as the boot and runtime
console.

Fixes ARM-software/tf-issues#572
Signed-off-by: Michalis Pappas <mpappas@fastmail.fm>

Add crash_console_init declaration to console.h
Only enable MULTI_CONSOLE_API for AArch64

Fixes ARM-software/tf-issues#571
Signed-off-by: Michalis Pappas <mpappas@fastmail.fm>

Add support for the new MULTI_CONSOLE_API

Crash information is now displayed in both the runtime and crash consoles,
if a crash occurs after the runtime console has been enabled

Enable MULTI_CONSOLE_API by default on qemu builds

Fixes ARM-software/tf-issues#561
Signed-off-by: Michalis Pappas <mpappas@fastmail.fm>