mfd: si476x-cmd: Fix several issues reported by codespell

Fix some typo, find by 'codespell drivers/mfd/si476x-cmd.c'

succsess -> success
interace -> interface
comand   -> command
failre   -> failure

Reported-by: k2ci <kernel-bot@kylinos.cn>
Signed-off-by: Jackie Liu <liuyun01@kylinos.cn>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20230206032231.3208296-1-liu.yun@linux.dev