ARC: reset: remove the misleading v1 suffix all over

There is no plan yet to do a v2 board. And even if we were to do it only
some IPs would actually change, so it be best to add suffixes at that
point, not now !

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>