EDAC/i7300: Correct the i7300_exit() function name in comment

The incorrect function name is being used in the comment for function
i7300_exit. Correct this.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20220805125008.2346559-1-colin.i.king@gmail.com