defconfig: 8974: disable SLUB_DEBUG on perf defconfig
defconfig: 8974: disable SLUB_DEBUG on perf defconfig

There is 30% improvement on some benchmarks with
CONFIG_SLUB_DEBUG disabled. Hence disable it on perf defconfig to
improve performance.

Change-Id: I257da78a172a4955f1fc6ef87ab571709cd639f4
Signed-off-by: Pratik Patel <1acbbdd4274e187eda89cfa6ac00592dcfca8a01@codeaurora.org>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas