ipq8064: Make clock code build in coreboot

Include clock.c in the appropriate coreboot stages, modify the code to
build cleanly. Use proper pointer cast in .h files.

BUG=chrome-os-partner:27784
TEST='emerge-storm coreboot' still succeeds

Change-Id: I227c871b17e571f6a1db3ada3821dbb1ee884e59
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/196407
4 files changed