drivers: soc: qcom: read current counter value before PMU save

Call perf_event_read_local() to update current counter value
in hw_perf_event structure before saving PMU snapshot to
shared memory.

Change-Id: Id5945cd6b6c9fab6f87917224b5b5f54dca5ef9c
Signed-off-by: Santosh Mardi <gsantosh@codeaurora.org>