target-arm: Common kvm_arm_vcpu_init() for KVM ARM and KVM ARM64

target-arm: Common kvm_arm_vcpu_init() for KVM ARM and KVM ARM64

Introduce a common kvm_arm_vcpu_init() for doing KVM_ARM_VCPU_INIT
ioctl in KVM ARM and KVM ARM64. This also helps us factor-out few
common code lines from kvm_arch_init_vcpu() for KVM ARM/ARM64.

Signed-off-by: Pranavkumar Sawargaonkar <[email protected]>
Signed-off-by: Anup Patel <[email protected]>
Reviewed-by: Peter Maydell <[email protected]>
Message-id: 1402901605[email protected]
Signed-off-by: Peter Maydell <[email protected]>