drivers/perf: hisi: Fix incorrect variable name "hha_pmu" in DDRC PMU driver

In the callback function write_evtype(), the variable name of struct
hisi_pmu should be "ddrc_pmu" instead of "hha_pmu".

Signed-off-by: Junhao He <hejunhao3@huawei.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Link: https://lore.kernel.org/r/20241210141525.37788-10-yangyicong@huawei.com


Signed-off-by: Will Deacon <will@kernel.org>