bitbake: Add fetch workaround for L4T 32.7.1 debs unpack

Tegra firmware debs fail to unpack after fetch in L4T 32.7.1
so we use a workaround in our local poky mirror to overcome this.

Upstream-status: Inappropriate [configuration]
Signed-off-by: Alexandru Costache <alexandru@balena.io>

bitbake/lib/bb/fetch2/__init__.py

@@ -1506,7 +1506,10 @@ def unpack(self, urldata, rootdir, data):
                         raise UnpackError("Unable to unpack deb/ipk package - does not contain data.tar.* file", urldata.url)
                 else:
                     raise UnpackError("Unable to unpack deb/ipk package - could not list contents", urldata.url)
-                cmd = 'ar x %s %s && tar --no-same-owner -xpf %s && rm %s' % (file, datafile, datafile, datafile)
+                if datafile.endswith('.tzst') or datafile.endswith('.tar.zst'):
+                    cmd = 'ar x %s %s && tar --use-compress-program=unzstd --no-same-owner -xpf %s && rm %s' % (file, datafile, datafile, datafile)
+                else:
+                    cmd = 'ar x %s %s && tar --no-same-owner -xpf %s && rm %s' % (file, datafile, datafile, datafile)
 
         # If 'subdir' param exists, create a dir and use it as destination for unpack cmd
         if 'subdir' in urldata.parm: