soc: qcom: Make llcc-qcom a generic driver

This makes way for adding future llcc versions.
Also pull out the llcc-qcom specific definitions from includes.
Includes path now contains the only definitions that are
to be exposed to other subsystems.

Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>