target-arm: Add feature unset function
Add an unset_feature() function to compliment the set_feature() function. This will be used to disable functions after they have been enabled during initialization. Signed-off-by: NGreg Bellows <greg.bellows@linaro.org> Reviewed-by: NPeter Maydell <peter.maydell@linaro.org> Message-id: 1418684992-8996-9-git-send-email-greg.bellows@linaro.org Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
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