drivers: perf: Remove the now superfluous sentinel elements from ctl_table array

drivers: perf: Remove the now superfluous sentinel elements from ctl_table array

This commit comes at the tail end of a greater effort to remove the
empty elements at the end of the ctl_table arrays (sentinels) which will
reduce the overall build time size of the kernel and run time memory
bloat by ~64 bytes per sentinel (further information Link :
https://lore.kernel.org/all/ZO5Yx5JFogGi%2FcBo@bombadil.infradead.org/)

Remove sentinel from sbi_pmu_sysctl_table

Signed-off-by: Joel Granados <j.granados@samsung.com>
Link: https://lore.kernel.org/r/20240328-jag-sysctl_remset_misc-v1-7-47c1463b3af2@samsung.com
Signed-off-by: Will Deacon <will@kernel.org>