drivers: soc: qcom: rpmh: Correctly set is_complete

Messages for wake set needs to have is_complete to true.
Setting is_complete to false is overriding previous
configuration for wake sets. Fix this.

Change-Id: I6dc7dc7beddc3d926b274cf8e66a2e5917ac6063
Signed-off-by: Maulik Shah <mkshah@codeaurora.org>