multilib: fix allarch/kernel/module-base multilib issues

- skip the non-packagegroup allarch recipes in multilib_virtclass_handler
- extend PROVIDES/RPROVIDES for allarch recipes which are not packagegroups
- use variants from MULTILIB_GLOBAL_VARIANTS (lib32 lib64 libx32) to create
additional pkgdata files for multilib allarch: ${pkgdatadir}/${variant}-${PN}
and ${pkgdatadir}/runtime/${variant}-${pkg}
- use variants from MULTILIB_VARIANTS to create additional pkgdata files
for multilib kernel/module-base recipes
- add a sanity check to determine if the current multilib is in
MULTILIB_GLOBAL_VARIANTS

[YOCTO #2918]
[YOCTO #3440]
[YOCTO #3565]
[YOCTO #3568]

(From OE-Core rev: bc4da2573dfb59ea2fc4af359701818df20f7663)

Signed-off-by: Constantin Musca <constantinx.musca@intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/sanity.bbclass

@@ -114,6 +114,8 @@ def check_toolchain(data):
         tune_error_set.append(tune_errors)
 
     multilibs = (data.getVar("MULTILIB_VARIANTS", True) or "").split()
+    global_multilibs = (data.getVar("MULTILIB_GLOBAL_VARIANTS", True) or "").split()
+
     if multilibs:
         seen_libs = []
         seen_tunes = []
@@ -122,6 +124,8 @@ def check_toolchain(data):
                 tune_error_set.append("The multilib '%s' appears more than once." % lib)
             else:
                 seen_libs.append(lib)
+            if not lib in global_multilibs:
+                tune_error_set.append("Multilib %s is not present in MULTILIB_GLOBAL_VARIANTS" % lib)
             tune = data.getVar("DEFAULTTUNE_virtclass-multilib-%s" % lib, True)
             if tune in seen_tunes:
                 tune_error_set.append("The tuning '%s' appears in more than one multilib." % tune)