payloads/edk2: Remove ABOVE_4G_MEMORY option

Remove the ABOVE_4G_MEMORY option as the option was removed in edk2
in commit dc5f2905ebfdf68ae28ce1081d435af0f8641dd9 (UefiPayloadPkg:
Always build MemoryTypeInformation HOB for DXE GCD
- https://github.com/tianocore/edk2/pull/4231).

Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Change-Id: I8d5ee79ef3f7ecfcd1463c612aad2e3d629df22a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74336
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>

payloads/external/edk2/Kconfig

@@ -111,16 +111,6 @@ config EDK2_VERBOSE_BUILD
 	  build log extremely verbose. This can be used to troubleshoot failed builds
 	  which are usually down to missing tools or toolchain.
 
-config EDK2_ABOVE_4G_MEMORY
-	bool "Enable above 4G memory"
-	default n
-	help
-	  Select this option to enable Above 4G Decode. This will allow the
-	  payload to use all of the memory, rather than an maximum of 4G.
-
-	  Disabling memory above 4G is useful for bootloaders that are not
-	  fully 64-bit aware such as Qubes R4.0.4 bootloader.
-
 config EDK2_BOOTSPLASH_FILE
 	string "edk2 Bootsplash path and filename"
 	default "Documentation/coreboot_logo.bmp"

payloads/external/edk2/Makefile

@@ -43,10 +43,6 @@ endif
 #
 # OPTION			= DEFAULT_VALUE
 #
-# ABOVE_4G_MEMORY		= TRUE
-ifneq ($(CONFIG_EDK2_ABOVE_4G_MEMORY),y)
-BUILD_STR += -D ABOVE_4G_MEMORY=FALSE
-endif
 # BOOTSPLASH_IMAGE		= FALSE
 ifneq ($(CONFIG_EDK2_BOOTSPLASH_FILE),)
 BUILD_STR += -D BOOTSPLASH_IMAGE=TRUE