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.bb

@@ -0,0 +1,17 @@
+SUMMARY = "Combined nanopb package"
+PV = "1.0"
+PR = "r1"
+
+PACKAGE_ARCH = "${MACHINE_ARCH}"
+
+inherit packagegroup
+
+DEPENDS = " \
+    nanopb-generator \
+    nanopb-runtime \
+"
+
+RDEPENDS:${PN} = " \
+    nanopb-generator \
+    nanopb-runtime \
+"