drivers: soc: Add LLCC driver

LLCC (Last Level Cache Controller) provides additional cache memory
in the system. LLCC is partitioned into muliple slices and each slice
getting its own priority, size, ID and other config parameters.
LLCC driver programs these parameters for each slice. Clients that are
assigned to use LLCC need to get information such size & ID of the slice
they get and activate or deactivate the slice as needed. LLCC driver
provides API interfaces for the clients to perform these operations.

Change-Id: I2ef80558248ed1a43515f6c973d236b6ec1f241c
Signed-off-by: Channagoud Kadabi <ckadabi@codeaurora.org>