[settings] Add config/settings.h

Move VMWARE_SETTINGS build configuration option from config/sideband.h
to a new config/settings.h.

Existing instances of config/local/sideband.h will not be affected,
since config.c still #includes config/sideband.h.

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

src/config/config.c

 #include <config/general.h>
 #include <config/console.h>
 #include <config/sideband.h>
+#include <config/settings.h>
 
 /** @file
  *
 REQUIRE_OBJECT ( efi_bofm );
 #endif /* BOFM_EFI */
 #endif /* CONFIG_BOFM */
+
+/*
+ * Drag in relevant settings sources
+ */
 #ifdef VMWARE_SETTINGS
 REQUIRE_OBJECT ( guestinfo );
-#endif /* VMWARE_SETTINGS */
+#endif
 
 /*
  * Drag in selected keyboard map

src/config/settings.h

+#ifndef CONFIG_SETTINGS_H
+#define CONFIG_SETTINGS_H
+
+/** @file
+ *
+ * Configuration settings sources
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+//#define	VMWARE_SETTINGS	/* VMware GuestInfo settings */
+
+#include <config/local/settings.h>
+
+#endif /* CONFIG_SETTINGS_H */

src/config/sideband.h

 FILE_LICENCE ( GPL2_OR_LATER );
 
 //#define	CONFIG_BOFM	/* IBM's BladeCenter Open Fabric Manager */
-//#define	VMWARE_SETTINGS	/* VMware GuestInfo settings */
 
 #include <config/local/sideband.h>