arch-arm: Fix GenericTimer param name in BaseArmKvmCPU

Per change [1], the new name for `int_virt` is `int_el1_virt`.

[1] https://gem5-review.googlesource.com/c/public/gem5/+/58109

Change-Id: Idde4ac831c7a323b80272642e6a48b1c5e488135
Signed-off-by: Hoa Nguyen <hoanguyen@ucdavis.edu>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/59309
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
1 file changed