coreos-kernel: Make build verbose

To aid in debugging kernel builds set the kernel make variable
V=1 to get verbose build output.

Signed-off-by: Geoff Levand <geoff@infradead.org>

sdk_container/src/third_party/coreos-overlay/eclass/coreos-kernel.eclass

@@ -120,6 +120,7 @@ kmake() {
 		KBUILD_OUTPUT="../build" \
 		KCFLAGS="${kernel_cflags}" \
 		LDFLAGS="" \
+		"V=1" \
 		"$@"
 }