drivers: qcom: rpmh: Do not send active votes in solver mode

When the controller is in solver mode, the RSC sequencer takes over the
control and s/w cannot send requests and receive interrupt response.
However, it is okay to write the sleep and wake votes.

Check for the state for the controller and the request in hand to see if
its okay to pass the request to the controller. Also, make the check for
all variants of the API, not just write_passthru.

Change-Id: I803ea0fe1c85df17763cc9700cc87816572470f3
Signed-off-by: Lina Iyer <ilina@codeaurora.org>