Add subsystemid option to sconfig

Allow user to add 'subsystemid <vendor> <device> [inherit]' to devicetree.cb for
PCI and PCI domain devices.

Example:

	device pci 00.0 on
	       subsystemid dead beef
	end

If the user wants to have this ID inherited to all subdevices/functions,
he can add 'inherit', like in the following example:

	device pci 00.0 on
	       subsystemid dead beef inherit
	end

If the user don't want to inherit a Subsystem for a single device, he can
specify 'subsystemid 0 0' on this particular device.

Signed-off-by: Sven Schnelle <svens@stackframe.org>
Acked-by: Peter Stuge <peter@stuge.se>

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@6420 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

src/include/device/device.h

@@ -64,6 +64,8 @@ struct device {
 	struct device_path path;
 	unsigned 	vendor;
 	unsigned 	device;
+	u16 subsystem_vendor;
+	u16  subsystem_device;
 	unsigned int	class;		/* 3 bytes: (base, sub, prog-if) */
 	unsigned int	hdr_type;	/* PCI header type */
 	unsigned int    enabled : 1;	/* set if we should enable the device */