Add dummy implementation of generic timer cp15 registers
Add a dummy implementation of the cp15 registers for the generic timer (found in the Cortex-A15), just sufficient for Linux to decide that it can't use it. This requires at least CNTP_CTL and CNTFRQ to be implemented as RAZ/WI; we RAZ/WI all of c14. Reviewed-by: NAndreas Färber <afaerber@suse.de> Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
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