reset: Return 0 if ops unimplemented and remove empty functions

In case the ops is not implemented, return 0 in the core right away.
This is better than having multiple copies of functions which just
return 0 in each reset driver. Drop all those empty functions.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Cc: Tom Rini <trini@konsulko.com>

drivers/reset/reset-scmi.c

@@ -65,14 +65,8 @@ static int scmi_reset_request(struct reset_ctl *rst)
 	return scmi_to_linux_errno(out.status);
 }
 
-static int scmi_reset_rfree(struct reset_ctl *rst)
-{
-	return 0;
-}
-
 static const struct reset_ops scmi_reset_domain_ops = {
 	.request	= scmi_reset_request,
-	.rfree		= scmi_reset_rfree,
 	.rst_assert	= scmi_reset_assert,
 	.rst_deassert	= scmi_reset_deassert,
 };