Restore d/control via sed rather than control.orig

Restore d/control via sed rather than control.orig

When the binary kernel module build is enabled, a new package is
autogenerated. This requires adding it to the debian/control file,
and then cleaning it up.
Doing this via a backup debian/control.orig file that is gitignored
is error prone and can lead to changes being inadvertently and
silently overwritten.
Use a sed expression to remove the exact autogenerated snippet
instead to avoid this issue.

Change-Id: If04c25d2b267f654475567b78a36fd1de8318d76
Signed-off-by: Luca Boccassi <luca.boccassi@gmail.com>