Update to commit c5d39fae ("Documentation: EM: Switch to
micro-Watts scale")

commit f48a0c47 ("Documentation: EM: Describe new registration
method using DT")
commit 75a3a99a ("PM: EM: Change the order of arguments in the
.active_power() callback")
commit 015f569c ("Documentation: EM: Add artificial EM
registration description")
Signed-off-by: Yanteng Si <siyanteng@loongson.cn>
Reviewed-by: Wu XiangCheng <bobwxc@email.cn>
Link: https://lore.kernel.org/r/06df12357d64d602a4dfb10a025a7520daeb3ba0.1670642548.git.siyanteng@loongson.cnSigned-off-by: Jonathan Corbet <corbet@lwn.net>