Merge remote-tracking branch 'remotes/lersek/tags/edk2-pull-2019-04-22' into staging

Advance the roms/edk2 submodule to the "edk2-stable201903" release, and
build and capture platform firmware binar

Merge remote-tracking branch 'remotes/lersek/tags/edk2-pull-2019-04-22' into staging

Advance the roms/edk2 submodule to the "edk2-stable201903" release, and
build and capture platform firmware binaries from that release. The
binaries are meant to be used by both end-users and by the "BIOS tables"
unit tests in qtest ("make check").

# gpg: Signature made Mon 22 Apr 2019 19:20:08 BST
# gpg: using RSA key D39DA71E0D496CFA
# gpg: Good signature from "Laszlo Ersek <lersek@redhat.com>" [marginal]
# gpg: WARNING: This key is not certified with sufficiently trusted signatures!
# gpg: It is not certain that the signature belongs to the owner.
# Primary key fingerprint: F5D9 660F 1BA5 F310 A95A C5E0 466A EAE0 6125 3988
# Subkey fingerprint: B3A5 5D3F 88A8 90ED 2E63 3E8D D39D A71E 0D49 6CFA

* remotes/lersek/tags/edk2-pull-2019-04-22:
MAINTAINERS: add the "EDK2 Firmware" subsystem
Makefile: install the edk2 firmware images and their descriptors
tests: add missing dependency to build QTEST_QEMU_BINARY, round 2
pc-bios: document the edk2 firmware images; add firmware descriptors
pc-bios: add edk2 firmware binaries and variable store templates
roms: build edk2 firmware binaries and variable store templates
roms/Makefile: replace the $(EDK2_EFIROM) target with "edk2-basetools"
roms/edk2-funcs.sh: add the qemu_edk2_get_thread_count() function
roms/edk2: advance to tag edk2-stable201903
tests/uefi-test-tools/build.sh: work around TianoCore#1607
roms/edk2-funcs.sh: require gcc-4.8+ for building i386 and x86_64
roms: lift "edk2-funcs.sh" from "tests/uefi-test-tools/build.sh"

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

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pc-bios: document the edk2 firmware images; add firmware descriptors

Update the README file with information on the images added previously,
and provide firmware descriptor documents that conform to

pc-bios: document the edk2 firmware images; add firmware descriptors

Update the README file with information on the images added previously,
and provide firmware descriptor documents that conform to
"docs/interop/firmware.json".

Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>

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