KVM: arm64: update arm64 openeuler_defconfig for CONFIG_VIRT_PLAT_DEV

virt inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8K8HP



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set CONFIG_VIRT_PLAT_DEV=y in arm64 openeuler_defconfig

Signed-off-by: Dongxu Sun <sundongxu3@huawei.com>