This allows `-cpu host` in KVM

Should be `x86legacy` as otherwise macOS 11 will fail to boot

closes https://github.com/acidanthera/bugtracker/issues/1950

OcBootManagementLib: Auto-detect `macOS Installer` text label for use when `.disk_label` file cannot be displayed
Fixes https://github.com/acidanthera/bugtracker/issues/1939

https://github.com/acidanthera/bugtracker/issues/1938

- Add support for .contentFlavour and .contentDetails
- Add LINUX_BOOT_ADD_RW flag
- Add flags+= and flags-=
- Fixed entry name disambiguation when LINUX_BOOT_USE_LATEST is unset

Only happened with SIP disabled.

Closes: https://github.com/acidanthera/bugtracker/issues/1925

Fixes: https://github.com/acidanthera/bugtracker/issues/1920

ocvalidate: Warn on insecure DmgLoading with secure SecureBootModel (already causes critical error in runtime)
Fixes: https://github.com/acidanthera/bugtracker/issues/1917

closes #312
closes acidanthera/bugtracker#1899

 - Fix broken in-OS sound in Windows after AudioDxe with some firmware (closes https://github.com/acidanthera/bugtracker/issues/1909)
 - Add Pcds for some AudioDxe code
 - Other minor updates
OcDebugLogLib:
 - Add DebugPrintDevicePathForHandle

 - DisconnectHda
 - AudioOutRange
 - Cirrus Logic (Apple) and QEMU fixes
 - Other fixes

OcBootManagementLib: Extend ProtectUefiServices quirk to restore hooks overwritten by GRUB2 shim as required