swupdate: fix build with lua extensions
swupdate: fix build with lua extensions

Add package for Lua extension and fix the build. SWUpdate
Makefile integrates now the install target and it can be simplified
in the recipe.

Signed-off-by: Stefano Babic <2c2905e0c2877c7e4ce40c7425e972302953fda5@denx.de>

sbabic/meta-swupdate,sbabic/meta-swupdate