Bootconfig fixes for v6.9-rc4:

- Fix potential static_command_line buffer overrun. Currently we allocate
  the memory for static_command_line based on "boot_command_line", but it
  will copy "command_line" into it. So we use the length of "command_line"
  instead of "boot_command_line" (as previously we did).
- Use memblock_free_late() in xbc_exit() instead of memblock_free() after
  the buddy system is initialized.
- Fix a kerneldoc warning.
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