package/*/*.mk: Fix indent

Change LIBFOO_PERMISSIONS everywhere to be a space-separated list.
As nothing was specified in the manual but all our lists are space
separated, there is no reason that this one should be made an exception.

Signed-off-by: Maxime Hadjinlian <maxime.hadjinlian@gmail.com>
Tested-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>