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/lib/oe/package_manager.py

@@ -460,7 +460,6 @@ class RpmPM(PackageManager):
                  target_rootfs,
                  target_vendor,
                  task_name='target',
-                 providename=None,
                  arch_var=None,
                  os_var=None):
         super(RpmPM, self).__init__(d)

meta/lib/oe/sdk.py

@@ -93,34 +93,16 @@ class RpmSdk(Sdk):
         self.host_manifest = RpmManifest(d, self.manifest_dir,
                                          Manifest.MANIFEST_TYPE_SDK_HOST)
 
-        target_providename = ['/bin/sh',
-                              '/bin/bash',
-                              '/usr/bin/env',
-                              '/usr/bin/perl',
-                              'pkgconfig'
-                              ]
-
         self.target_pm = RpmPM(d,
                                self.sdk_target_sysroot,
                                self.d.getVar('TARGET_VENDOR'),
                                'target',
-                               target_providename
                                )
 
-        sdk_providename = ['/bin/sh',
-                           '/bin/bash',
-                           '/usr/bin/env',
-                           '/usr/bin/perl',
-                           'pkgconfig',
-                           'libGL.so()(64bit)',
-                           'libGL.so'
-                           ]
-
         self.host_pm = RpmPM(d,
                              self.sdk_host_sysroot,
                              self.d.getVar('SDK_VENDOR'),
                              'host',
-                             sdk_providename,
                              "SDK_PACKAGE_ARCHS",
                              "SDK_OS"
                              )