libsmi: add configure file

Add configure file duplicated from file smi.conf-example in source code
and replace paths with mibs files directories.

Then set libsmi-mibs as runtime recommend package to provide mibs files.

Add homepage and update SRC_URI as well.

Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>