kernel-selftest: Exclude from world builds

Avoid need for installing clang on host, or depending on meta-clang

Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-kernel/kernel-selftest/kernel-selftest.bb

@@ -117,3 +117,7 @@ INSANE_SKIP_${PN} += "ldflags"
 SECURITY_CFLAGS = ""
 COMPATIBLE_HOST_libc-musl = 'null'
 
+# It has native clang/llvm dependency, poky distro is reluctant to include them as deps
+# this helps with world builds on AB
+EXCLUDE_FROM_WORLD = "1"
+