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The FWU Multi Bank Update feature allows the platform to boot the firmware images from one of the partitions(banks). On the Developerbox, SCP-firmware running on the SCB(Cortex-M3) passes the value of the boot index on the NOR flash. Add a function to read the boot index value from the NOR flash. Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org>