regulator: Add module.h to drivers/regulator users as required

Another group of drivers that are taking advantage of the implicit
presence of module.h -- and will break when we pull the carpet out
from under them during a cleanup.  Fix 'em now.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
diff --git a/drivers/regulator/fixed.c b/drivers/regulator/fixed.c
index 2fe9d99c..21ecf21 100644
--- a/drivers/regulator/fixed.c
+++ b/drivers/regulator/fixed.c
@@ -20,6 +20,7 @@
 
 #include <linux/err.h>
 #include <linux/mutex.h>
+#include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/fixed.h>