nativesdk/sdk: Update sdk dummy providers

When we migrated rpm v5 -> v4, we lost the ability to drop "per file"
dependencies from the rpm backend for things like "/bin/bash" and
"/usr/bin/env" which meant the sdks were becomming 'bloated'.

This restores the functionality using a dummy package, similarly to
the way the buildtools perl issue was addressed. It also removes
the non-functional old code so as not to confuse people in future.

I ran into this problem trying to filter dependencies to only rpms
a build directly depends upon and it turns out we have some determinism issues
in this area so this is something key to fix.

(From OE-Core rev: 9d490dc01dcedb216129b22cbe17a6c99efc4f5c)

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

meta/recipes-core/packagegroups/nativesdk-packagegroup-sdk-host.bb

@@ -25,6 +25,7 @@ RDEPENDS_${PN} = "\
     nativesdk-cmake \
     nativesdk-postinst-intercept \
     ${@bb.utils.contains('DISTRO_FEATURES', 'wayland', 'nativesdk-wayland', '', d)} \
+    nativesdk-sdk-provides-dummy \
     "
 
 RDEPENDS_${PN}_darwin = "\