payloads/tianocore: update MrChromebox UEFIPAYLOAD branch

Update tianocore branch used with default UEFIPAYLOAD option to
mrchromebox/uefipayload_202107 (July 2021) branch. This branch is
rebased on edk2 upstream commit 12e34cd2f7900578ee83cb01b8f1696a7bb7511b
[OvmfPkg/Bhyve: clean up TPM_ENABLE remnants] vs tag edk2-stable202105.

The main changes are fixes for e820 table parsing and support to disable
"Above 4G decode", which is required to boot distros with bootloaders
that expect to be loaded into RAM below 4G. This fixes booting with
Qubes, ZorinOS, Proxmox, among others.

Additionally, several commits on top of upstream have been consolidated,
reworked, and/or reordered for readability and maintainability.

Change-Id: I6f04fd027a0599ca6892a1376938108a2e402ac2
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56569
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
diff --git a/payloads/external/tianocore/Makefile b/payloads/external/tianocore/Makefile
index 92a809a..ef3aacf 100644
--- a/payloads/external/tianocore/Makefile
+++ b/payloads/external/tianocore/Makefile
@@ -6,7 +6,7 @@
 project_name=Tianocore
 project_dir=$(CURDIR)/tianocore
 project_git_repo=https://github.com/mrchromebox/edk2
-project_git_branch=uefipayloadpkg
+project_git_branch=uefipayload_202107
 upstream_git_repo=https://github.com/tianocore/edk2
 
 build_flavor=-D BOOTLOADER=COREBOOT -D PCIE_BASE=$(CONFIG_MMCONF_BASE_ADDRESS) -DPS2_KEYBOARD_ENABLE
@@ -14,7 +14,6 @@
 ifeq ($(CONFIG_TIANOCORE_UPSTREAM),y)
 TAG=upstream/master
 else
-# STABLE revision is MrChromebox's UefiPayloadPkg (ueifpayloadpkg) branch
 TAG=origin/$(project_git_branch)
 endif