kbuild: suppress modpost warnings for references from the .toc section as used by powerpc

We should do better here by effetively "dereferencing" references to
the .toc (or the .got2) section, but that is much harder.
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

scripts/mod/modpost.c

@@ -870,9 +870,12 @@ static void warn_sec_mismatch(const char *modname, const char *fromsec,
 		return;
 
 	/* fromsec whitelist - without a valid 'before'
-	 * powerpc has a GOT table in .got2 section */
+	 * powerpc has a GOT table in .got2 section
+	 * and also a .toc section */
 	if (strcmp(fromsec, ".got2") == 0)
 		return;
+	if (strcmp(fromsec, ".toc") == 0)
+		return;
 
 	if (before && after) {
 		warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s "