[staging/apei]: New branch request for APEI work

[Achin Gupta <achin.gupta@arm.com>]

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Hi All,

I would like to create a branch for implementing support for APEI in EDK2. The
intent is to upstream modules that are capable of creating the HEST, BERT, ERST
and EINJ after gathering error and error source information from the platform
and other sources. The work is still very nascent and the branch will be first
populated with some workarounds. These will be used as the basis for further
development.

Could you please do the needful. The attached readme has been populated with
some basic information.

cheers,
Achin

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This branch will be used to develop support for ACPI Platform Error Interfaces
(APEI) on ARMv8-A standard platforms.

The branch owners: Achin Gupta <achin.gupta@arm.com>, James Morse <james.morse@arm.com>

# Feature Introduction
The ACPI specification describes APEI which provide a mechanism for the firmware
to convey error information to OSPM. This branch will be used to implement
support for these interfaces in EDK2 and test them on ARM platforms.

# Aims
Upstream support for APEI to EDK2

# Related Modules
* MdeModulePkg
* ArmPkg