OvmfPkg: remove CsmSupportLib

CsmSupportLib is not used by any platform at this point, remove it.

This patch removes mentions of the following CSM resources from the source
code [*]:

- GUIDs (protocols or otherwise):
  - SYSTEM_ROM_FILE_GUID (1547B4F3-3E8A-4FEF-81C8-328ED647AB1A)
  - gEfiFirmwareVolumeProtocolGuid (by cutting the
    <Protocol/FirmwareVolume.h> link)
  - gEfiLegacyBiosPlatformProtocolGuid
  - gEfiLegacyBiosProtocolGuid
  - gEfiLegacyInterruptProtocolGuid

- headers:
  - FrameworkDxe.h
  - Protocol/FirmwareVolume.h
  - Protocol/LegacyBiosPlatform.h
  - Protocol/LegacyInterrupt.h

which extends the list of resources scheduled for removal to:

- GUIDs (protocols or otherwise):
  - SYSTEM_ROM_FILE_GUID (1547B4F3-3E8A-4FEF-81C8-328ED647AB1A)
  - gEfiFirmwareVolumeProtocolGuid
  - gEfiLegacy8259ProtocolGuid
  - gEfiLegacyBiosPlatformProtocolGuid
  - gEfiLegacyBiosProtocolGuid
  - gEfiLegacyInterruptProtocolGuid

- headers:
  - FrameworkDxe.h
  - Protocol/FirmwareVolume.h
  - Protocol/Legacy8259.h
  - Protocol/LegacyBios.h
  - Protocol/LegacyBiosPlatform.h
  - Protocol/LegacyInterrupt.h

[*] Note that gEfiLegacyRegion2ProtocolGuid, while a CSM-related protocol,
cannot be scheduled for removal, because the protocol GUID is defined in
"MdePkg.dec", and it's not only "OvmfPkg/Csm/CsmSupportLib" that produces
it in all of edk2, but also "MdeModulePkg/Universal/LegacyRegion2Dxe" (not
used by OVMF). For the same reason, the "Protocol/LegacyRegion2.h" header
(from MdePkg) cannot be scheduled for removal.

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=4588
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20231110235820.644381-23-lersek@redhat.com>
Reviewed-by: Jiewen Yao <Jiewen.yao@intel.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Corvin Köhne <corvink@FreeBSD.org>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>

0 files changed, 0 insertions, 0 deletions