doc: imx: psb: Document usage of SRC_GPR10 PERSIST_SECONDARY_BOOT for A/B switching

Document SRC_GPR10 PERSIST_SECONDARY_BOOT functionality. This is useful for
reliable bootloader A/B updates, as it permits switching between two copies
of bootloader at different offsets of the same storage. The switch happens
in case one copy is corrupted OR can be enforced by user. This functionality
is present at least since i.MX53, however is poorly documented in all known
SoC datasheets, hence this document aims to clarify the usage, currently on
i.MX7D and i.MX8MM.

Signed-off-by: Marek Vasut <[email protected]> # Original MX7D work, this document
Signed-off-by: Igor Opaniuk <[email protected]> # All the MX8M work
Cc: Christoph Niedermaier <[email protected]>
Cc: Fabio Estevam <[email protected]>
Cc: Harald Seiler <[email protected]>
Cc: Igor Opaniuk <[email protected]>
Cc: Jan Kiszka <[email protected]>
Cc: Ludwig Zenz <[email protected]>
Cc: Marcel Ziswiler <[email protected]>
Cc: Peng Fan <[email protected]>
Cc: Stefano Babic <[email protected]>
Cc: Ye Li <[email protected]>
Cc: uboot-imx <[email protected]>
Reviewed-by: Peng Fan <[email protected]>

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