arch-arm: Forward declare kvm_vcpu_init
arch-arm: Forward declare kvm_vcpu_init

Signed-off-by: Giacomo Travaglini <8eef13a4f970e2e9372c8d26ad0737b760f99c02@arm.com>
Change-Id: I6fa5be48498d1a8f9c070e9ded11e8cadd4b89a1
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/47679
Reviewed-by: Jason Lowe-Power <92de577f37050ad05b60626d2f17913f40dcb1a2@gmail.com>
Reviewed-by: Daniel Carvalho <91779fc734d358d9575ec4910de29bfcbcaf1b22@yahoo.com.br>
Maintainer: Jason Lowe-Power <92de577f37050ad05b60626d2f17913f40dcb1a2@gmail.com>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

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