HID: samples/hidraw: make it possible to select device

Makefile that can actually build the example, and allow selecting device to
work on.

Signed-off-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/samples/hidraw/Makefile b/samples/hidraw/Makefile
index 382eeae..a9ab961 100644
--- a/samples/hidraw/Makefile
+++ b/samples/hidraw/Makefile
@@ -8,3 +8,5 @@
 always := $(hostprogs-y)
 
 HOSTCFLAGS_hid-example.o += -I$(objtree)/usr/include
+
+all: hid-example