phy: qualcomm: ipq806x-usb: Fix kernel-doc style

The functions are documented but there were style issues, so fix
the style and add missing description for phy_dwc3

drivers/phy/qualcomm/phy-qcom-ipq806x-usb.c:130:
drivers/phy/qualcomm/phy-qcom-ipq806x-usb.c:174:
drivers/phy/qualcomm/phy-qcom-ipq806x-usb.c:212: warning:
This comment starts with '/**', but isn't a kernel-doc comment.
Refer Documentation/doc-guide/kernel-doc.rst

Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211120061531.410771-1-vkoul@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: vinodkoul

drivers/phy/qualcomm/phy-qcom-ipq806x-usb.c

@@ -127,12 +127,13 @@ struct phy_drvdata {
 };
 
 /**
- * Write register and read back masked value to confirm it is written
+ * usb_phy_write_readback() - Write register and read back masked value to
+ * confirm it is written
  *
- * @base - QCOM DWC3 PHY base virtual address.
- * @offset - register offset.
- * @mask - register bitmask specifying what should be updated
- * @val - value to write.
+ * @phy_dwc3: QCOM DWC3 phy context
+ * @offset: register offset.
+ * @mask: register bitmask specifying what should be updated
+ * @val: value to write.
  */
 static inline void usb_phy_write_readback(struct usb_phy *phy_dwc3,
 					  u32 offset,
@@ -171,11 +172,11 @@ static int wait_for_latch(void __iomem *addr)
 }
 
 /**
- * Write SSPHY register
+ * usb_ss_write_phycreg() - Write SSPHY register
  *
- * @base - QCOM DWC3 PHY base virtual address.
- * @addr - SSPHY address to write.
- * @val - value to write.
+ * @phy_dwc3: QCOM DWC3 phy context
+ * @addr: SSPHY address to write.
+ * @val: value to write.
  */
 static int usb_ss_write_phycreg(struct usb_phy *phy_dwc3,
 				u32 addr, u32 val)
@@ -209,10 +210,11 @@ static int usb_ss_write_phycreg(struct usb_phy *phy_dwc3,
 }
 
 /**
- * Read SSPHY register.
+ * usb_ss_read_phycreg() - Read SSPHY register.
  *
- * @base - QCOM DWC3 PHY base virtual address.
- * @addr - SSPHY address to read.
+ * @phy_dwc3: QCOM DWC3 phy context
+ * @addr: SSPHY address to read.
+ * @val: pointer in which read is store.
  */
 static int usb_ss_read_phycreg(struct usb_phy *phy_dwc3,
 			       u32 addr, u32 *val)