imx: initialize and use generic timer on i.MX 6UL/ULL
The i.MX 6UL/ULL feature a Cortex-A7 CPU which suppor the ARM generic timer. This change makes use of the ARM generic timer in U-Boot. This is crucial to make the ARM generic timers usable in Linux since timer_init() initalizes the system counter module, which is necessary to use the generic timers CP15 registers. Signed-off-by: NStefan Agner <stefan.agner@toradex.com> Reviewed-by: NFabio Estevam <fabio.estevam@nxp.com>
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