[console] Add keymap generator

Inspired by LILO's keytab-lilo.pl, genkeymap.pl uses "loadkeys -b" to
obtain a Linux keyboard map, and generates a file keymap_xx.c in
hci/keymap.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/hci/keymap/keymap_mt.c

@@ -0,0 +1,21 @@
+/** @file
+ *
+ * "mt" keyboard mapping
+ *
+ * This file is automatically generated; do not edit
+ *
+ */
+
+FILE_LICENCE ( PUBLIC_DOMAIN );
+
+#include <ipxe/keymap.h>
+
+/** "mt" keyboard mapping */
+struct key_mapping mt_mapping[] __keymap = {
+	{ 0x22, 0x40 },	/* '"' => '@' */
+	{ 0x23, 0x04 },	/* '#' => Ctrl-D */
+	{ 0x40, 0x22 },	/* '@' => '"' */
+	{ 0x5c, 0x23 },	/* '\\' => '#' */
+	{ 0x7c, 0x7e },	/* '|' => '~' */
+	{ 0x7f, 0x08 },	/* 0x7f => Ctrl-H */
+};