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This patch fixes the logic used to calculate the CPU index for
storing the per-cpu wake times. We use the MIDR register to
calculate the CPU index now. This allows us to store values for
Denver/A57 CPUs properly.

Change-Id: I9df0377afd4b92bbdaea495c0df06a9780a99d09
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>