ARM: S5PV210: Remove usage of clk_h200 clock and add clk_hclk_msys clock

The clk_h200 represents the HCLK for the MSYS domain. This clock
is of type 'struct clk' but on V210, it is more suitable to be of
type 'struct clksrc_clk' (since it is a divided version of the
armclk). The replacement clock is renamed as clk_hclk_msys to
indicate that it represents the HCLK for MSYS domain.

This patch modifies the following.

1. Removes the usage of the clk_h200 clock.
2. Adds the new clock 'clk_hclk_msys'.
3. Adds clk_hclk_msys to the list of sysclks to be registered.
4. Modifies the hclk_msys clock rate calculation procedure to
   be based on the new clk_hclk_msys clock.

Signed-off-by: Thomas Abraham <thomas.ab@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>