Investigate dual-bank OTA

[sahil-kale]

Currently, the voyager bootloader does not explicitly offer support for dual-banked flash systems. However, a user can actually implement dual-banked flash by getting smart with the nvm_read function. A user can add a variable dictating what partition they want to write to that is accessed every time nvm_read is accessed, and based on that variable, returns the correct application size/crc/app start/end addresses.

I don't think this is something the bootloader should support by 'knowing' about the partition as it will deviate from making the bootloader agnostic. Instead, writing a guide and demo on this should be sufficient as the user can effectively control where in flash memory is written and implement dual/triple/n banked systems with this strategy. Might also need a demo