greybus: interface: remove unique id

Remove the unimplemented interface unique-id.

There will eventually be an interface-serial-number attribute provided,
but let's not export it or commit to a name for this attribute until we
need it.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/Documentation/sysfs-bus-greybus

@@ -107,13 +107,6 @@ Contact:	Greg Kroah-Hartman <greg@kroah.com>
 Description:
 		Product ID string of a Greybus interface block.
 
-What:		/sys/bus/greybus/device/endoE:M:I/unique_id
-Date:		October 2015
-KernelVersion:	4.XX
-Contact:	Greg Kroah-Hartman <greg@kroah.com>
-Description:
-		Unique ID of a Greybus interface block.
-
 What:		/sys/bus/greybus/device/endoE:M:I/vendor
 Date:		October 2015
 KernelVersion:	4.XX

drivers/staging/greybus/interface.c

@@ -23,7 +23,6 @@ static DEVICE_ATTR_RO(field)
 gb_interface_attr(device_id, d);
 gb_interface_attr(vendor, x);
 gb_interface_attr(product, x);
-gb_interface_attr(unique_id, llX);
 gb_interface_attr(vendor_string, s);
 gb_interface_attr(product_string, s);
 
@@ -31,7 +30,6 @@ static struct attribute *interface_attrs[] = {
 	&dev_attr_device_id.attr,
 	&dev_attr_vendor.attr,
 	&dev_attr_product.attr,
-	&dev_attr_unique_id.attr,
 	&dev_attr_vendor_string.attr,
 	&dev_attr_product_string.attr,
 	NULL,

drivers/staging/greybus/interface.h

@@ -26,7 +26,6 @@ struct gb_interface {
 	u16 product;
 	char *vendor_string;
 	char *product_string;
-	u64 unique_id;
 
 	/* Information taken from the hotplug event */
 	u32 unipro_mfg_id;

drivers/staging/greybus/manifest.c

@@ -396,7 +396,6 @@ static bool gb_manifest_parse_interface(struct gb_interface *intf,
 	// Vendor, Product and Unique id must come via control protocol
 	intf->vendor = 0xffff;
 	intf->product = 0x0001;
-	intf->unique_id = 0;
 
 	/* Release the interface descriptor, now that we're done with it */
 	release_manifest_descriptor(interface_desc);