defconfig: Disable debug option in SDX12 perf build

Disable below debug options for WLAN throughput in SDX12 perf build:
  CONFIG_SLUB_DEBUG
  CONFIG_DEBUG_PREEMPT
  CONFIG_SCHED_DEBUG
  CONFIG_DEBUG_INFO
  CONFIG_HAVE_DEBUG_KMEMLEAK
  CONFIG_DEBUG_BUGVERBOSE
  CONFIG_CC_HAS_KASAN_GENERIC

Change-Id: I2372c8e0541e3e386e78cfad8ca1aa08156b4344
Signed-off-by: Wu Gao <wugao@codeaurora.org>