config: use standardized /boot/config-$(uname -r)

Most Linux distributions (e.g. Debian, Fedora) use
/boot/config-$(uname -r)
for the Kernel configuration file.

Hence the deploy directory should also contain a file of this name.
The user can copy this file to directory /boot without renaming.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Robert Nelson <robertcnelson@gmail.com>