ARM: S5PV210: Remove usage of clk_p100 and add clk_pclk_msys clock

The clk_p100 clock, which is the PCLK clock for MSYS domain, is of
type 'struct clk' whereas on S5PV210, this clock is suitable to be
of type clksrc_clk clock (since it has a choice of clock source
and a pre-divider). So this patch replaces the 'struct clk' type
clock to 'struct clksrc_clk' type clock for the PCLK MSYS clock.

This patch modifies the following.

1. Remove definitions and usage of 'clk_p100' clock.
2. Adds 'clk_pclk_msys' clock which is of type 'struct clksrc_clk'.
3. Replace all usage of clk_p100 with clk_pclk_msys clock.
4. Adds clk_pclk_msys into list of clocks to be registered.

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>