Add supporting scripts for the OpenPOWER P9 processor.

Add Witherspoon power sequencer configuration scripts.
Add P9 VCS workaround script.
Add P9 SBE start instructions script.

Partially resolves openbmc/openbmc#647

Change-Id: I0a25b2fc0fc74b2a88fd7d2c77b59aa72e0b2876
Signed-off-by: Sergey Solomin <sergey.solomin@us.ibm.com>
2 files changed