USB: serial: option: reimplement interface masking

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Wed, Mar 07, 2018 at 05:40:48PM +0100, Johan Hovold wrote:
> Reimplement interface masking using device flags stored directly in the
> device-id table. This will make it easier to add and maintain device-id
> entries by using a more compact and readable notation compared to the
> current implementation (which manages pairs of masks in separate
> blacklist structs).
> 
> Two convenience macros are used to flag an interface as either reserved
> or as not supporting modem-control requests:
> 
> 	{ USB_DEVICE(TELIT_VENDOR_ID, TELIT_PRODUCT_ME910_DUAL_MODEM),
> 	  .driver_info = NCTRL(0) | RSVD(3) },
> 
> For now, we limit the highest maskable interface number to seven, which
> allows for (up to 16) additional device flags to be added later should
> need arise.
> 
> Note that this will likely need to be backported to stable in order to
> make future device-id backports more manageable.
> 
> Signed-off-by: Johan Hovold <johan@kernel.org>

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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