Patch from Sascha Hauer

This patch supports the Hynix developer boards h7201 and h7202 for the
HMS30C7201 and HMS30C7202 CPUs.

Changes to previous patch:
- reorganized file structure. We now have common.c which shares stuff
  common to all h720x processors and cpu-h720[12].c files for the cpu
  specific stuff
- fixed timer handling for timers 1/2
- cleaned up h720x register definitions and splitted in files specific
  to each cpu and one generic part

Signed-off-by: Thomas Gleixner
Signed-off-by: Robert Schwebel
Signed-off-by: Sascha Hauer