payloads/tianocore: Rename TianoCore to edk2

coreboot uses TianoCore interchangeably with EDK II, and whilst the
meaning is generally clear, it's not the payload it uses. EDK II is
commonly written as edk2.

coreboot builds edk2 directly from the edk2 repository. Whilst it
can build some components from edk2-platforms, the target is still
edk2.

[1] tianocore.org - "Welcome to TianoCore, the community supporting"
[2] tianocore.org - "EDK II is a modern, feature-rich, cross-platform
firmware development environment for the UEFI and UEFI Platform
Initialization (PI) specifications."

Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Change-Id: I4de125d92ae38ff8dfd0c4c06806c2d2921945ab
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65820
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

Documentation/mainboard/facebook/monolith.md

@@ -104,11 +104,11 @@ solution. Wires need to be connected to be able to flash using an external progr
 - SMBus
 - Initialization with FSP
 - SeaBIOS payload (commit a5cab58e9a3fb6e168aba919c5669bea406573b4)
-- TianoCore payload (commit 860a8d95c2ee89c9916d6e11230f246afa1cd629)
+- edk2 payload (commit 860a8d95c2ee89c9916d6e11230f246afa1cd629)
 - LinuxBoot (kernel kernel-4_19_97) (uroot commit 9c9db9dbd6b532f5f91a511a0de885c6562aadd7)
 - eMMC
 
-All of the above has been briefly tested by booting Linux from eMMC using the TianoCore payload
+All of the above has been briefly tested by booting Linux from eMMC using the edk2 payload
 and LinuxBoot.
 
 SeaBios has been checked to the extend that it runs to the boot selection and provides display