drivers/perf: hisi: Fix typo in events attribute array

Fix up one typo: wr_dr_64b -> wr_ddr_64b.

Fixes: 2bab3cf9 ("perf: hisi: Add support for HiSilicon SoC HHA PMU driver")
Signed-off-by: Shaokun Zhang <zhangshaokun@hisilicon.com>
Cc: Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/1587643530-34357-1-git-send-email-zhangshaokun@hisilicon.com


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