phy: mediatek: tphy: Clarify and add kerneldoc to mtk_phy_pdata

As struct mtk_phy_pdata was almost fully documented, transfer
the comments into kerneldoc on top.
While at it, also rewrite the comments to both improve the writing
writing and the actual information in the documentation, and add a
description for the `version` member of the structure.

Signed-off-by: AngeloGioacchino Del Regno <[e-mail]>
Reviewed-by: Neil Armstrong <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Vinod Koul <[e-mail]>

drivers/phy/mediatek/phy-mtk-tphy.c

···
 	MTK_PHY_V3,
 };
 
+/**
+ * mtk_phy_pdata - SoC specific platform data
+ * @avoid_rx_sen_degradation: Avoid TX Sensitivity level degradation (MT6795/8173 only)
+ * @sw_pll_48m_to_26m:        Workaround for V3 IP (MT8195) - switch the 48MHz PLL from
+ *                            fractional mode to integer to output 26MHz for U2PHY
+ * @sw_efuse_supported:       Switches off eFuse auto-load from PHY and applies values
+ *                            read from different nvmem (usually different eFuse array)
+ *                            that is pointed at in the device tree node for this PHY
+ * @version:                  PHY IP Version
+ */
 struct mtk_phy_pdata {
-	/* avoid RX sensitivity level degradation only for mt8173 */
 	bool avoid_rx_sen_degradation;
-	/*
-	 * workaround only for mt8195, HW fix it for others of V3,
-	 * u2phy should use integer mode instead of fractional mode of
-	 * 48M PLL, fix it by switching PLL to 26M from default 48M
-	 */
 	bool sw_pll_48m_to_26m;
-	/*
-	 * Some SoCs (e.g. mt8195) drop a bit when use auto load efuse,
-	 * support sw way, also support it for v2/v3 optionally.
-	 */
 	bool sw_efuse_supported;
 	enum mtk_phy_version version;
 };