Move console definitions into a new console.h file

The console includes a global variable and several functions that are only
used by a small subset of U-Boot files. Before adding more functions, move
the definitions into their own header file.

Signed-off-by: Simon Glass <sjg@chromium.org>

board/esd/common/cmd_loadpci.c

@@ -7,6 +7,7 @@
 
 #include <common.h>
 #include <command.h>
+#include <console.h>
 #if !defined(CONFIG_440)
 #include <asm/4xx_pci.h>
 #endif

board/esd/cpci405/cpci405.c

@@ -5,6 +5,7 @@
  * SPDX-License-Identifier:	GPL-2.0+
  */
 #include <common.h>
+#include <console.h>
 #include <libfdt.h>
 #include <fdt_support.h>
 #include <asm/processor.h>

board/esd/pmc405de/pmc405de.c

@@ -6,6 +6,7 @@
  */
 
 #include <common.h>
+#include <console.h>
 #include <libfdt.h>
 #include <fdt_support.h>
 #include <asm/processor.h>

board/esd/pmc440/cmd_pmc440.c

@@ -6,6 +6,7 @@
  */
 #include <common.h>
 #include <command.h>
+#include <console.h>
 #include <asm/io.h>
 #include <asm/cache.h>
 #include <asm/processor.h>

board/esd/pmc440/pmc440.c

@@ -13,6 +13,7 @@
  * SPDX-License-Identifier:	GPL-2.0+
  */
 #include <common.h>
+#include <console.h>
 #include <libfdt.h>
 #include <fdt_support.h>
 #include <asm/ppc440.h>

board/esd/vme8349/caddy.c

@@ -8,6 +8,7 @@
  */
 
 #include <common.h>
+#include <console.h>
 #include <ioports.h>
 #include <mpc83xx.h>
 #include <asm/mpc8349_pci.h>