drivers: soc: qcom: Add sdm640 SoC llcc driver

Add LLCC driver which contains the configuration data required to
program the LLCC on SDM640 SoC. The configration data controls the
behavior of LLCC by setting priority, size, how the ways are allocated
when clients use the LLCC and so on. Platform specific driver calls into
the common LLCC driver to program this configuration.

Change-Id: Ie53c7087bd90dbdbc5c207c8994a93e6a8479941
Signed-off-by: Srinivas Ramana <sramana@codeaurora.org>