drivers/perf: hisi: Remove redundant initialized of pmu->name

mainline inclusion
from mainline-v6.4-rc1
commit 25d8c250
category: cleanup
bugzilla: https://gitee.com/openeuler/kernel/issues/I77IH6
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=25d8c25025a46e7621edde2eb6d5f55c6d29ee86



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"pmu->name" is initialized by perf_pmu_register() function, so remove
the redundant initialized in hisi_pmu_init().

Signed-off-by: Junhao He <hejunhao3@huawei.com>