Patch from Ben Dooks

This patch does the following:

- move the clock initialisation to just after the cpu init
- add the two clocks for the s3c2440
- add dclk0/1 and clkout0/1 definitions
- add list of clocks to the board specific struct
- fix initialisation of the clock control
- update handling of parent clocks for >1 parent

this fixes the following problems:

- serial console with no clock sources
- clocks specific to various boards
- hang if LCD controller enabled at start time

Signed-off-by: Ben Dooks