clk: qoriq: fix a register offset error

The offset of Core Cluster clock control/status register
on cluster group V3 version is different from others, and
should be plus 0x70000.

Signed-off-by: Tang Yuantian <yuantian.tang@nxp.com>
Reviewed-by: Scott Wood <oss@buserror.net>
Fixes: 9e19ca2f ("clk: qoriq: Add ls2080a support.")
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>