drivers/leds: Add module.h to files using it implicitly

A pending cleanup will mean that module.h won't be implicitly
everywhere anymore.  Make sure the modular drivers in the leds
dir are actually calling out for <module.h> explicitly in advance.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
diff --git a/drivers/leds/leds-net5501.c b/drivers/leds/leds-net5501.c
index 7e764b8..0555d47 100644
--- a/drivers/leds/leds-net5501.c
+++ b/drivers/leds/leds-net5501.c
@@ -16,6 +16,7 @@
 #include <linux/leds.h>
 #include <linux/platform_device.h>
 #include <linux/gpio.h>
+#include <linux/module.h>
 
 #include <asm/geode.h>