configure.ac: use pkgconfig to define ODP and ODP helper libraries variables
configure.ac: use pkgconfig to define ODP and ODP helper libraries variables

We use pkg-config to check ODP library but don't use ODP_CFLAGS/ODP_LIBS
later on.
In addition, we don't use pkg-config for ODP helper library.

Use pkg-config to define ODP and ODP helper libraries and their include
directories.
Display the variables results for info/debug purpose.

Signed-off-by: Fathi Boudra <7cd6e55cc07a66bc71d7901a4cddfe6c22aab659@linaro.org>
Reviewed-by: Sorin Vultureanu <8013ba55f8675034bc2ab0d6c3a1c9650437ca36@enea.com>

OpenFastPath/ofp,TolikH/ofp,TolikH/ofp,OpenFastPath/ofp,OpenFastPath/ofp,OpenFastPath/ofp,TolikH/ofp