procd: add direct dependencies on libblobmsg-json and libjson-c

procd: add direct dependencies on libblobmsg-json and libjson-c

The OpenWrt buildroot ABI version rebuild tracker does not handle
transient dependencies, therefor add all libraries linked by procd
as direct dependencies to the corresponding binary package definition.

This ensures that procd is automatically rebuilt and relinked
if any of these libraries has its ABI_VERSION updated in the
future.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>