phy: mapphone-mdm6600: Add missing description for some structure fields

We get warning with W=1 build:
drivers/phy/motorola/phy-mapphone-mdm6600.c:185: warning: Function
parameter or member 'val' not described in 'phy_mdm6600_cmd'
drivers/phy/motorola/phy-mapphone-mdm6600.c:200: warning: Function
parameter or member 'work' not described in 'phy_mdm6600_status'

Fix that by adding description for 'val' and 'work'

Link: https://lore.kernel.org/r/20200708132809.265967-2-vkoul@kernel.orgSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/phy/motorola/phy-mapphone-mdm6600.c

@@ -178,6 +178,7 @@ static const struct phy_ops gpio_usb_ops = {
 /**
  * phy_mdm6600_cmd() - send a command request to mdm6600
  * @ddata: device driver data
+ * @val: value of cmd to be set
  *
  * Configures the three command request GPIOs to the specified value.
  */
@@ -194,7 +195,7 @@ static void phy_mdm6600_cmd(struct phy_mdm6600 *ddata, int val)
 
 /**
  * phy_mdm6600_status() - read mdm6600 status lines
- * @ddata: device driver data
+ * @work: work structure
  */
 static void phy_mdm6600_status(struct work_struct *work)
 {