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To allow other layers to easily provide a default kernel preference to use with the Raspberry Pi MACHINEs, switch to use the ??= assignment operator for setting the default kernel and the device tree value in this layer. This change is motivated by enabling Xen support in meta-virtualization to use the raspberrypi4-64 MACHINE definition from this layer with the Yocto Linux kernels. Signed-off-by: Christopher Clark <christopher.w.clark@gmail.com>