[console] Add keyboard map selection

The active keyboard map may be selected by editing KEYBOARD_MAP in
config/console.h.

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

src/config/config.c

 REQUIRE_OBJECT ( efi_bofm );
 #endif /* BOFM_EFI */
 #endif /* CONFIG_BOFM */
+
+/*
+ * Drag in selected keyboard map
+ */
+#define REQUIRE_KEYMAP_OBJECT( _map ) REQUIRE_OBJECT ( keymap_ ## _map )
+#define REQUIRE_KEYMAP( _map ) REQUIRE_KEYMAP_OBJECT ( _map )
+REQUIRE_KEYMAP ( KEYBOARD_MAP );

src/config/console.h

 //#define	CONSOLE_PC_KBD		/* Direct access to PC keyboard */
 //#define	CONSOLE_SYSLOG		/* Syslog console */
 
+#define	KEYBOARD_MAP	us
+
 #include <config/local/console.h>
 
 #endif /* CONFIG_CONSOLE_H */