drivers/perf: hisi: Define a symbol namespace for HiSilicon Uncore PMUs

drivers/perf: hisi: Define a symbol namespace for HiSilicon Uncore PMUs

The HiSilicon Uncore PMU framework implements some common functions
and exported them to the drivers. Use a specific HISI_PMU namespace
for the exported symbols to avoid pollute the generic ones.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Link: https://lore.kernel.org/r/20241210141525.37788-2-yangyicong@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>