(WIP) update coreboot

DO NOT MERGE! We want coreboot-4.10, not coreboot-git. This is for testing only!
DO NOT MERGE! This is unfinished.

Update coreboot from 4.8.1 to the git master branch HEAD at build-time and
port patches:
* 0000-measure-boot -> 0001
* 0030-sandybridge -> 0002

TODO:
* backport patch 0009-Add-heads-TPM-measurements-to-Skylake-Kabylake -> 0003
* coreboot defconfig update for all boards!
  including: instead of 0007-intel-fsp-fsp2_0-Fix-FSP-2.0-headers-to-match-github
  (configure FSP_USE_REPO?) Needed for skylake/kabylake
* coreboot's DIV_ROUND_UP statement expression usage in sha1.h doesn't work for me.
  help wanted, see sha1.h for the details.
* TEST! especially skylake/kabylake
* switch to coreboot 4.10 and remove all old patches

All other patches against coreboot-4.8.1 seem to be part of coreboot now.

For an overview of the changes in coreboot, see
https://doc.coreboot.org/releases/coreboot-4.9-relnotes.html

config/coreboot-x230.config

@@ -17,8 +17,6 @@ CONFIG_CONSOLE_CBMEM_BUFFER_SIZE=0x80000
 CONFIG_DEFAULT_CONSOLE_LOGLEVEL_5=y
 CONFIG_PAYLOAD_LINUX=y
 CONFIG_PAYLOAD_FILE="../../build/x230/bzImage"
-CONFIG_PAYLOAD_OPTIONS=""
-# CONFIG_PXE is not set
 CONFIG_LINUX_COMMAND_LINE="intel_iommu=igfx_off quiet"
 CONFIG_LINUX_INITRD="../../build/x230/initrd.cpio.xz"
 CONFIG_DEBUG_SMM_RELOCATION=y

modules/coreboot

@@ -1,13 +1,13 @@
 modules-$(CONFIG_COREBOOT) += coreboot
 
-#coreboot_version := git
-#coreboot_repo := https://github.com/osresearch/coreboot
-coreboot_version := 4.8.1
+coreboot_version := git
+coreboot_repo := https://github.com/coreboot/coreboot
+# coreboot_version := 4.8.1
 coreboot_base_dir := coreboot-$(coreboot_version)
 coreboot_dir := $(coreboot_base_dir)/$(BOARD)
-coreboot_tar := coreboot-$(coreboot_version).tar.xz
-coreboot_url := https://www.coreboot.org/releases/$(coreboot_tar)
-coreboot_hash := f0ddf4db0628c1fe1e8348c40084d9cbeb5771400c963fd419cda3995b69ad23
+# coreboot_tar := coreboot-$(coreboot_version).tar.xz
+# coreboot_url := https://www.coreboot.org/releases/$(coreboot_tar)
+# coreboot_hash := f0ddf4db0628c1fe1e8348c40084d9cbeb5771400c963fd419cda3995b69ad23
 
 # Coreboot builds are specialized on a per-target basis.
 # The builds are done in a per-target subdirectory