USB: Rename "msm72k_otg.c" to "msm_otg.c"

This driver is used across all MSM SoCs.  Hence give a generic name.
All Functions and strutures are also using "msm_otg" as prefix.

Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/include/linux/usb/msm_hsusb.h b/include/linux/usb/msm_hsusb.h
index 3675e03..3657403 100644
--- a/include/linux/usb/msm_hsusb.h
+++ b/include/linux/usb/msm_hsusb.h
@@ -55,7 +55,7 @@
 
 /**
  * struct msm_otg_platform_data - platform device data
- *              for msm72k_otg driver.
+ *              for msm_otg driver.
  * @phy_init_seq: PHY configuration sequence. val, reg pairs
  *              terminated by -1.
  * @vbus_power: VBUS power on/off routine.