A series of fixes applied to master and across stable branches where
needed to fix running Xen on the Raspberry Pi 4 board.

This updates Linux kernel configuration for Xen to remove tracking from
the linux-yocto-dev kernel, either by applying a fixed revision and
specification of a stable branch or replacing it with the linux-yocto
kernel. The Xen build configuration is updated to remove the hypervisor
defconfig for the Raspberry Pi and drop the arm64 prelink patch as a
license correction and since the build no longer needs it with the newer
gcc toolchain.

Tested on hardware.

Christopher Clark

gatesgarth:
01: linux-yocto-dev, raspberrypi: apply fixed revision to kernel
02: xen: drop patch to workaround prelink on aarch64
03: xen: fix boot on the Raspberry Pi 4

hardknott:
04: linux-yocto-dev, raspberrypi: apply fixed revision to kernel
05: xen: drop patch to workaround prelink on aarch64
06: xen: fix boot on the Raspberry Pi 4

honister:
07: linux-yocto-dev, xen, raspberrypi: remove tracking bbappend
08: xen: drop patch to workaround prelink on aarch64
09: xen: fix boot on the Raspberry Pi 4 with Xen 4.14

kirkstone:
10: xen, raspberry pi: replace linux-yocto-dev with linux-yocto 5.15

master:
11: xen, raspberry pi: replace linux-yocto-dev with linux-yocto 5.15