UPSTREAM: clk: rockchip: fix cpuclk registration error handling

UPSTREAM: clk: rockchip: fix cpuclk registration error handling

It maybe due to a copy-paste error the error handing should be
cclk not clk when checking if the cpuclk registration succeeded.

Reported-by: Lin Huang <lin.huang@rock-chips.com>
Signed-off-by: Xing Zheng <zhengxing@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
(cherry picked from git.kernel.org mmind/linux-rockchip.git
v4.7-clk/fixes commit df43cf8f1c116f26fcfd89ce9b1119929c732597)

Change-Id: I7d21808194c914e9117c498309e4b69861799318
Signed-off-by: Xing Zheng <zhengxing@rock-chips.com>