driver: soc: qcom: update pmu cache status for hotplug

When the core is coming up online during hotplug, set pmu cache
status flag to PMU_MAP_INVALID until new pmu map is updated
to RIMPS. This update is needed to discard the cached pmu
values until new pmu map is sent to RIMPS and pmu cache flag
is updated to PMU_CACHE_INVALID.

Change-Id: I24fe117c4cb0e20a154b0dfe6b0af04d244d0bdc
Signed-off-by: Santosh Mardi <gsantosh@codeaurora.org>