soc/intel/skl: Fix error code of send_global_reset()

With commit f2eb687d19 (soc/intel/{cnl,icl,skl,tgl,common}: Make
changes to send_heci_reset_req_message()) the return value was
changed on a single path. Update the other paths too, even though
it's the discouraged 0-is-failure.

Change-Id: I179a6a4b1e13565dd58c908eb2a9725052a4de9d
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45633
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/soc/intel/skylake/me.c

@@ -340,7 +340,7 @@ void intel_me_status(void)
 
 int send_global_reset(void)
 {
-	int status = -1;
+	int status = 0;
 	union me_hfsts1 hfs1;
 
 	if (!is_cse_enabled())