soc/intel/common/block: Add HECI driver

Add common driver that can send/receive HECI messages. This driver is
inspired by Linux kernel mei driver and somewhat based on Skylake's.
Currently it has been only tested on Apollolake.

TEST=tested on Apollolake to send single messages and receive both
fragmented and non-fragmented versions.

Change-Id: Ie3772700270f4f333292b80d59f79555851780f7
Signed-off-by: Andrey Petrov <>
Reviewed-by: Aaron Durbin <>
Tested-by: build bot (Jenkins)
4 files changed