docs: perf: Add description for Alibaba's T-Head PMU driver

Alibaba's T-Head SoC implements uncore PMU for performance and functional
debugging to facilitate system maintenance. Document it to provide guidance
on how to use it.

Signed-off-by: Shuai Xue <[email protected]>
Reviewed-by: Jonathan Cameron <[email protected]>
Reviewed-by: Baolin Wang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

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