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FWU: synquacer: Add FWU Multi Bank Update and BL2 boot support

Created by: masahisak

Add FWU Multi Bank Update and boot BL2 from FIP image support for SynQuacer platform.

When the DSW 3-4 is on, SynQuacer platform will decode FWU metadata and platform metadata to choose the active bank of the FIP image and boot BL2 from it.

This also enables the platform trial boot, which count up the boot counter in the platform metadata, and when it reaches to the limit (== 3) it switch back to the previous active bank. This counter will stop when the BL33 (typically U-Boot) clears the counter.

Signed-off-by: Jassi Brar Signed-off-by: Masami Hiramatsu Signed-off-by: Masahisa Kojima Change-Id: I00b9c932fac5b4a9a231fcf2a050b766abefed61

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