drivers: qcom: cmd-db: Report if command DB is initialized as standalone

The command DB may be initialized outside the AOP, indicated by the
reserved bit 0. Export this information through a function.

Change-Id: I7b8c685cc03d919c5adb1b91134078bd96599bbd
Signed-off-by: Lina Iyer <ilina@codeaurora.org>