drivers: soc: qcom: rimps_memlat: add configs to get PMU/AMU count

Add CONFIG options to get the number of AMUs and PMUs supported on
a given target to define the size of structures accordingly in driver.

Change-Id: I6ed58465f789156887a28bd49da7220396854e50
Signed-off-by: Santosh Mardi <gsantosh@codeaurora.org>