Convert the remaining exynos clock drivers to use
samsung_clk_register_cpu() or if possible use
samsung_cmu_register_one(). With this we can now make
exynos_register_cpu_clock() a static function so that future CPU clock
registration changes will use the samsung common clock driver.
The main benefit of this change is that it standardizes the CPU clock
registration for the samsung clock drivers.
Signed-off-by: Will McVicker<willmcvicker@xxxxxxxxxx>