kconfig: disable CONFIG_KASAN

KASAN has some performance penalty, and on some KMS test cases (cursor, vblank, flip, etc.) it's very noticeable (+50% or something), generally maybe +1-5%. Even if timings on tests are tuned to KASAN, then some real problems or slowdowns might slip through with KASAN-less kernel and timing data is important.

So, disabling KASAN from "real testing" on xe same as i915. We can have separate weekly runs with KASAN enabled builds.

Signed-off-by: Swati Sharma swati2.sharma@intel.com