[PATCH] backports: add "MBIM Extended Functional Descriptor" structure definition

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commit 477c6d345604 ("backports: add USB_CDC_MBIM_EXTENDED_TYPE if needed")
added define but the structure definition that goes with it is also needed.
As they were introduced in the same kernel version we can add the structure
with the same #ifndef USB_CDC_MBIM_EXTENDED_TYPE.

Signed-off-by: Arend van Spriel <arend.vanspriel@xxxxxxxxxxxx>
 backport/backport-include/linux/usb/cdc.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/backport/backport-include/linux/usb/cdc.h b/backport/backport-include/linux/usb/cdc.h
index 2097949..5ad31bf 100644
--- a/backport/backport-include/linux/usb/cdc.h
+++ b/backport/backport-include/linux/usb/cdc.h
@@ -15,6 +15,17 @@
+/* "MBIM Extended Functional Descriptor" from CDC MBIM spec 1.0 errata-1 */
+struct usb_cdc_mbim_extended_desc {
+	__u8	bLength;
+	__u8	bDescriptorType;
+	__u8	bDescriptorSubType;
+	__le16	bcdMBIMExtendedVersion;
+	__u8	bMaxOutstandingCommandMessages;
+	__le16	wMTU;
+} __attribute__ ((packed));

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