media: ngene: Replace semaphore i2c_switch_mutex with mutex

The semaphore 'i2c_switch_mutex' is used as a simple mutex, so
it should be written as one. Semaphores are going away in the future.

Signed-off-by: Binoy Jayan <binoy.jayan@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/pci/ngene/ngene.h

@@ -765,7 +765,7 @@ struct ngene {
 	struct mutex          cmd_mutex;
 	struct mutex          stream_mutex;
 	struct semaphore      pll_mutex;
-	struct semaphore      i2c_switch_mutex;
+	struct mutex          i2c_switch_mutex;
 	int                   i2c_current_channel;
 	int                   i2c_current_bus;
 	spinlock_t            cmd_lock;