consoles: remove unused infrastructure

The __console attribute as well as linker binding
was dropped at some point. Kill of the dead code and
infrastructure.

Change-Id: I15e1fb4468fffe2e148ec9ac8539dfd958551807
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/10279
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

src/include/console/console.h

@@ -34,12 +34,6 @@ struct console_driver {
 	int (*tst_byte)(void);
 };
 
-#define __console	__attribute__((used, __section__ (".rodata.console_drivers")))
-
-/* Defined by the linker... */
-extern struct console_driver console_drivers[];
-extern struct console_driver econsole_drivers[];
-
 void post_code(u8 value);
 #if CONFIG_CMOS_POST_EXTRA
 void post_log_extra(u32 value);