Android: fix missing trailing \

In commit bbe998791d6c ("Android's major/minor/makedev live in
<sys/sysmacros.h>"), it didn't apply cleanly and I missed the trailing
\, so add it here.

Signed-off-by: Rob Herring <robh@kernel.org>
diff --git a/Android.common.mk b/Android.common.mk
index 4b5462f..b45ca10 100644
--- a/Android.common.mk
+++ b/Android.common.mk
@@ -1,6 +1,6 @@
 # XXX: Consider moving these to config.h analogous to autoconf.
 LOCAL_CFLAGS += \
-	-DMAJOR_IN_SYSMACROS=1
+	-DMAJOR_IN_SYSMACROS=1 \
 	-DHAVE_VISIBILITY=1 \
 	-DHAVE_LIBDRM_ATOMIC_PRIMITIVES=1