Patch merged into coreboot/master: skylake: fix SMI GPI status handling

the following patch was just integrated into master:
commit af030503e8037f8147196290ea681192ab6b7732
Author: Aaron Durbin 
Date:   Sat Aug 8 01:11:32 2015 -0500

skylake: fix SMI GPI status handling

The current construction for processing SMI GPI events
    didn't allow for the mainboard to query the state of a
    particular GPI for the snapshotted SMI event. The
    skylake part can route GPIs from any (there are design
    limitations) GPIO group. Those status and enable registers
    are within the GPIO community so one needs to gather
    all the possibilities in order to query the state.

The call chain did this:
    southbridge_smi_gpi(
    	clear_alt_smi_status() -> reset_alt_smi_status() ->
    	print_all_smi_status() -> return 0)

As a replacement the following functions and types are
    introduced:

struct gpi_status - represent gpi status.
    gpi_status_get() - per gpi query on struct gpi_status
    gpi_clear_get_smi_status() - clear and retrieve SMI GPI status
    mainboard_smi_gpi_handler() - mainboard handler using gpi_status

Also remove gpio_enable_all_smi() as that construct was never
    used, but it also is quite heavy handed in that it would
    enable SMI generation for all GPIs.

BUG=chrome-os-partner:43778
    BRANCH=None
    TEST=Built.

Original-Change-Id: Ief977e60de65d9964b8ee58f2433cae5c93872ca
    Original-Signed-off-by: Aaron Durbin 
    Original-Reviewed-on: https://chromium-review.googlesource.com/291933
    Original-Reviewed-by: Duncan Laurie

Change-Id: Ida009393c6af88ffe910195dc79a4c0d2a4c029e
    Signed-off-by: Aaron Durbin 
    Reviewed-on: http://review.coreboot.org/11208
    Tested-by: build bot (Jenkins)
    Reviewed-by: Patrick Georgi

See http://review.coreboot.org/11208 for details.

-gerrit