perf docs: Update metric usage for Alibaba's T-Head PMU driver (arm64)

Alibaba's T-Head ali_drw PMU supports DDR bandwidth metrics. Update
its usage in the documentation.

Reviewed-by: John Garry <[email protected]>
Signed-off-by: Jing Zhang <[email protected]>
Acked-by: Ian Rogers <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Shuai Xue <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Zhuo Song <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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