openvswitch: make dependencies conditional for openvswitch-python subpackage

Apparently, even if you don't select the `openvswitch-python` package,
Python still gets built (for the target build).

But, if the python dependencies are conditional on the
`PACKAGE_openvswitch-python` symbol then they aren't build.

This should improve build times, if you only want to build the
`openvswitch` package.

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>

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