livepatch: fix ELF typos

ELF is acronym.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/Y/3vWjQ/SBA5a0i5@p183