feat(intel): restructure watchdog

This patch is to restructure watchdog.
Move platform dependent MACROs to individual platform socfpga_plat_def.
Common watchdog code file and header file will remain for those common
declaration.

Change-Id: Ibb640f08ac313bbad6d9295596cb8ff26e3e626d
Signed-off-by: Sieu Mun Tang <sieu.mun.tang@intel.com>
5 files changed