fwu: add a script to generate FWU metadata

Added a script to generate FWU metadata.
The generated FWU metadata is designed as a sample, specifically
setting the active_bank index to 0. This adjustment ensures that
the booting firmware (BL2) can utilize the specified index to
load images from flash, providing a useful functionality for
firmware update scenarios.

Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
Change-Id: Iead6897b5979653aa362bd52c105b239c7ee682e
1 file changed