soc/apollolake: Add ish_enable in soc_intel_apollolake_config

Also initialize IshEnable in Silicon Init UPD with the value from
devicetree.cb

Signed-off-by: Hannah Williams <hannah.williams@intel.com>
Change-Id: I8f57a7353471cc3efa21c7011cdd0b369d25275d
Reviewed-on: https://review.coreboot.org/14894
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
2 files changed