clk: samsung: Add clock driver for S5PV210 and compatible SoCs

clk: samsung: Add clock driver for S5PV210 and compatible SoCs

This patch adds new, Common Clock Framework-based clock driver for Samsung
S5PV210 and compatible SoCs. The driver is just added, without enabling it yet.

Signed-off-by: Mateusz Krawczuk <[email protected]>
Signed-off-by: Kyungmin Park <[email protected]>
[t.figa: Added support for other SoC variants and clock output. Fixed
remaining minor issues.]
Signed-off-by: Tomasz Figa <[email protected]>
Signed-off-by: Kukjin Kim <[email protected]>