UPSTREAM: clk: rockchip: rk3368: fix cpuclk mux bit of big cpu-cluster

UPSTREAM: clk: rockchip: rk3368: fix cpuclk mux bit of big cpu-cluster

Both clusters have their mux bit in bit 7 of their respective register.
For whatever reason the big cluster currently lists bit 15 which is
definitly wrong.

Fixes: 3536c97a52db ("clk: rockchip: add rk3368 clock controller")
Reported-by: Zhang Qing <zhangqing@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: zhangqing <zhangqing@rock-chips.com>
Cc: stable@vger.kernel.org
(cherry picked from git.kernel.org mmind/linux-rockchip.git v4.6-clk/next
 commit 535ebd428aeb07c3327947281306f2943f2c9faa)

Change-Id: I26364fdba8cdfe36c8b9ba767b4226c9ac6ff118