boot_serial: minor fixes in 'erase_range()' log output and for 'bs_list()'

[pepe2k]

This short series includes 3 minor fixes for boot_serial:

1. drop redundant parameters from bs_list() The buf and len parameters aren't used inside bs_list() function.

2. boot_serial: include flash area offset in log info Currently, log info in erase_range() and bs_upload() shows range being erased/written relative to selected flash area which might be misleading. Include flash area offset in output so that the absolute addresses of the range being erased/written are shown.

3. don't use %j length modifier with Zephyr's minimal libc The Zephyr's 'Minimal C library' doesn't support the %j length modifier when cbprintf is configured with minimum features.

[pepe2k]

@nordicjm

Seems like the "Writing at ..." parts should be updated also

I've added that in second commit (boot_serial: include flash area offset in log info).

Thanks!

[nordicjm]

Format needs updating for CI to pass

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