kernel-selftest: Specify the target with -target instead of -arch

This ensures that generated code is properly cross compiled

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

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

@@ -45,7 +45,7 @@ EXTRA_OEMAKE = '\
     CROSS_COMPILE=${TARGET_PREFIX} \
     ARCH=${ARCH} \
     CC="${CC}" \
-    CLANG="clang -fno-stack-protector -arch ${ARCH} ${TOOLCHAIN_OPTIONS}" \
+    CLANG="clang -fno-stack-protector -target ${TARGET_ARCH} ${TOOLCHAIN_OPTIONS}" \
     AR="${AR}" \
     LD="${LD}" \
     DESTDIR="${D}" \