nanopb: Split into 2 packages

This makes it possible to avoid building components which are not used
in the native or runtime tooling. Most users of nanopb just want to
build `nanopb-generator-native` and `nanopb-runtime` and not the other
two combinations as they are building software for their target
leveraging nanopb.

Signed-off-by: William A. Kennington III <wak@google.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/dynamic-layers/meta-python/recipes-devtools/nanopb/nanopb-runtime_0.4.8.bb

@@ -0,0 +1,16 @@
+require nanopb.inc
+
+EXTRA_OECMAKE += " \
+  -Dnanopb_PROTOC_PATH=/bin/false \
+  -Dnanopb_BUILD_RUNTIME=ON \
+  -Dnanopb_BUILD_GENERATOR=OFF \
+  "
+
+# Maintain compatability with old header locations for packages
+# which haven't yet migrated to `nanopb/pb*.h`
+do_install:append() {
+  for hdr in ${D}${includedir}/nanopb/*; do
+	ln -sv nanopb/$(basename "$hdr") ${D}${includedir}/
+  done
+}
+