source/kernel: Add kvm availability

[seungukshin]

Add support for testing if a node can use virtualization for use by kata-containers (see https://katacontainers.slack.com/archives/C879ACQ00/p1761731112286659). On AMD and Intel platforms this can be determined with CPU feature flags, but on arm64 the situation is more complex. There 2 two flags - ID_AA64PFR0_EL1.EL2 (doc) and ID_AA64MMFR1_EL1.VH (doc)

• ID_AA64PFR0_EL1.EL2 & 0b0001 != 0 (kernel runs at EL1, hyp world at EL2 - nVHE)
• ID_AA64MMFR1_EL1.VH & 0b0001 != 0 (kernel is at EL2 using VHE), not visible from user space

Instead, check if kvm is initialized and has created /sys/devices/virtual/misc/kvm.

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