Revert "net: usb: cdc_ncm: don't spew notifications"

This reverts commit de658a19 as it
breaks the abi at the moment.

We will bring it back in a bit, when the next kabi break happens.

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I2bfa5e180f377af552230ff170ea0a45fef1347e