Drop unused mutexes in 3 drivers. Backport from Linux 2.6.

git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@4327 7894878c-1315-0410-8ee3-d5d059ff63e0

kernel/chips/adm1026.c

@@ -298,7 +298,6 @@ static int adm1026_scaling[] = {  /* .001 Volts */
 
 struct adm1026_data {
 	struct i2c_client client;
-	struct semaphore lock;
 	int sysctl_id;
 	enum chips type;
 

kernel/chips/bmcsensors.c

@@ -38,7 +38,6 @@
 */
 
 struct bmcsensors_data {
-	struct semaphore lock;
 	int sysctl_id;
 
 	struct semaphore update_lock;

kernel/chips/lm85.c

@@ -373,7 +373,6 @@ struct lm85_autofan {
 
 struct lm85_data {
 	struct i2c_client client;
-	struct semaphore lock;
 	int sysctl_id;
 	enum chips type;