kbuild: remove dependency on input.h from file2alias

Almost all definitions used by file2alias was already
present in mod_devicetable.h.
Added the last definition and killed the input.h usage.

The errornous include was pointed out
by: Jan Engelhardt <jengelh@linux01.gwdg.de>

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Jan Engelhardt <jengelh@linux01.gwdg.de>
Cc: Deepak Saxena <dsaxena@plexity.net>
diff --git a/include/linux/input.h b/include/linux/input.h
index bde65c8..13d510c 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -1010,6 +1010,10 @@
 #error "EV_MAX and INPUT_DEVICE_ID_EV_MAX do not match"
 #endif
 
+#if KEY_MIN_INTERESTING != INPUT_DEVICE_ID_KEY_MIN_INTERESTING
+#error "KEY_MIN_INTERESTING and INPUT_DEVICE_ID_KEY_MIN_INTERESTING do not match"
+#endif
+
 #if KEY_MAX != INPUT_DEVICE_ID_KEY_MAX
 #error "KEY_MAX and INPUT_DEVICE_ID_KEY_MAX do not match"
 #endif