Since commit bddb9b68 ("drivers/perf: commonise PERF_EVENTS
dependency"), all perf drivers depend on PERF_EVENTS config under a
common menu.

Config ARM_SPE_PMU still declares explicitly a dependency on
PERF_EVENTS, which is unneeded, so remove it.
Acked-by: NMark Rutland <mark.rutland@arm.com>
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NWill Deacon <will.deacon@arm.com>