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[BSRAM] Add Backup SRAM support for LYRA boards and relative test

Emilio Corigliano requested to merge bsram-lyra-biscotto into main

Uses the BSRAM driver in the kernel to initialize the Backup SRAM and the .preserve section based on the last reset cause. Preserved variables need to be declared with the PRESERVE macro attribute that automatically places them in the .preserve section.

To change the value of a preserved variable, a WriteEnableLock must be acquired.

Also a test for the backup SRAM has been implemented.

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