soc: qcom: Add support to read apps stats from smem

The trustzone will write apps stats into smem. This change
adds support to read and display it when rpmh_unit_base is
not present.

Change-Id: Ifc3566018fd6722eb2d818d8d81370dc1f8cea19
Signed-off-by: Tushar Nimkar <tnimkar@codeaurora.org>