pwm: lp3943: Drop unused i2c include

lp3943 is a platform driver that doesn't use any symbol provided in
<linux/i2c.h>. So drop the include.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

drivers/pwm/pwm-lp3943.c

@@ -8,7 +8,6 @@
  */
 
 #include <linux/err.h>
-#include <linux/i2c.h>
 #include <linux/mfd/lp3943.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>