libmodulemd: Extend to nativesdk

libmodulemd: Extend to nativesdk

Avoids universe fetch warnings:

WARNING: Nothing PROVIDES 'nativesdk-libmodulemd' (but virtual:nativesdk:/home/pokybuild/yocto-worker/build-appliance/build/meta/recipes-devtools/libdnf/libdnf_0.22.3.bb DEPENDS on or otherwise requires it). Close matches:
WARNING: Nothing RPROVIDES 'nativesdk-libdnf-dev' (but virtual:nativesdk:/home/pokybuild/yocto-worker/build-appliance/build/meta/recipes-devtools/libdnf/libdnf_0.22.3.bb RDEPENDS on or otherwise requires it)
WARNING: Nothing RPROVIDES 'nativesdk-libdnf' (but virtual:nativesdk:/home/pokybuild/yocto-worker/build-appliance/build/meta/recipes-devtools/libdnf/libdnf_0.22.3.bb RDEPENDS on or otherwise requires it)
WARNING: Nothing RPROVIDES 'nativesdk-dnf' (but virtual:nativesdk:/home/pokybuild/yocto-worker/build-appliance/build/meta/recipes-devtools/dnf/dnf_4.0.9.bb RDEPENDS on or otherwise requires it)
WARNING: Nothing RPROVIDES 'nativesdk-dnf-dev' (but virtual:nativesdk:/home/pokybuild/yocto-worker/build-appliance/build/meta/recipes-devtools/dnf/dnf_4.0.9.bb RDEPENDS on or otherwise requires it)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>