This is the base EC implementation, which provides a high level
interface to the EC for use by the rest of the kernel. The actual
communcations is dealt with by a separate protocol driver which
registers itself with this interface.

Interrupts are passed on through a notifier.

A simple message structure is used to pass messages to the
protocol driver.
Signed-off-by: NSimon Glass <sjg@chromium.org>
Signed-off-by: NChe-Liang Chiou <clchiou@chromium.org>
Signed-off-by: NJonathan Kliegman <kliegs@chromium.org>
Signed-off-by: NLuigi Semenzato <semenzato@chromium.org>
Signed-off-by: NOlof Johansson <olofj@chromium.org>
Signed-off-by: NVincent Palatin <vpalatin@chromium.org>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>