bootstage: powerpc: support fdt stash and reporting
This implements stashing of bootstage timing data to FDT and automatic timing reporting. To enable define CONFIG_BOOTSTAGE_FDT and CONFIG_BOOTSTAGE_REPORT respectively. Signed-off-by: NRommel G Custodio <sessyargc+u-boot@gmail.com> Reviewed-by: NYork Sun <yorksun@freescale.com>
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