This is in preparation for enabling counters other than PMCCNTR
Signed-off-by: NAaron Lindsay <alindsay@codeaurora.org>
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Message-id: 1523997485-1905-5-git-send-email-alindsay@codeaurora.org
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>