infra/pkg-kconfig: join comments to the related code-block

The current layout of comments wrt. to the related code-blocks is a bit
hard to handle visually.

Remove empty lines between the comments and their respective related
code-blocks.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Acked-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>