UBUNTU: Packaging: Depends on linux-base that provides the necessary tools

UBUNTU: Packaging: Depends on linux-base that provides the necessary tools

BugLink: http://bugs.launchpad.net/bugs/1767133
We Depends on linux-base because of linux-update-symlinks and
linux-check-removal. Those have been introduced in a version later than
4.0ubuntu1, which shipped on Xenial.

The unversioned Depends makes some upgrades to Bionic and installations of
linux-hwe-edge to break because those tools are not found during the configure
phase.

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Acked-by: Seth Forshee <seth.forshee@canonical.com>
Acked-by: Andy Whitcroft <andy.whitcroft@canonical.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>