soc: qcom: rpmh: Fix sending incorrect data during flush

During flush of current cached data, Sleep and Wake TCSes have
previously programmed data present. Due to this incorrect data
is sent.

Fix this by cleaning TCSes and freshly program current cached
sleep and wake data.

Change-Id: I8f1cb9925a7800aad65d665192d3b129c76dd9de
Signed-off-by: Maulik Shah <mkshah@codeaurora.org>