Revert "drivers: qcom: cmd-db: modularize commandDB driver"

This reverts commit 75afa532.
Too many things rely on cmd-db to be built in to allow it to
be built as a module.

Change-Id: I317ba89a7d3c9f88832e73834b65bcccac79bbe1
Signed-off-by: Lina Iyer <ilina@codeaurora.org>