soc: qcom: rpmh-rsc: Correctly handle zero active TCS for solver mode

If we made an active request on a RSC that does not have a dedicated TCS
for active state use, then re-purposed wake TCSes should be checked for not
busy before setting solver mode.

Change-Id: I8a493f4ac15d31df5b1963e5ae0d5d9966b482cc
Signed-off-by: Maulik Shah <mkshah@codeaurora.org>