KVM: Move KVM_REG_SIZE() definition to common uAPI header

Define KVM_REG_SIZE() in the common kvm.h header, and delete the arm64 and
RISC-V versions.  As evidenced by the surrounding definitions, all aspects
of the register size encoding are generic, i.e. RISC-V should have moved
arm64's definition to common code instead of copy+pasting.

Acked-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Muhammad Usama Anjum <usama.anjum@collabora.com>
Link: https://lore.kernel.org/r/20241128005547.4077116-2-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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