fix(drivers/marvell/comphy): fix name of 3.125G SerDes mode

There is no support for 2.5/3.125G SGMII. This 3.125G SerDes mode is not
SGMII. It is just plain 1000Base-X (as defined in IEEE 802.3z standard)
but upclocked 2.5x. This mode is commonly known under name 2500Base-X.

So remove incorrect SGMII keyword from names and comments and replace it
by more adequate 2500Base-X keyword.

There is no functional change in code, just renaming macros and updating
comments.

Signed-off-by: Pali Rohár <pali@kernel.org>
Change-Id: If79aec16cc233f4896aafd75bfbbebb3f172a197
diff --git a/drivers/marvell/comphy/phy-comphy-common.h b/drivers/marvell/comphy/phy-comphy-common.h
index e3b430a..c599437 100644
--- a/drivers/marvell/comphy/phy-comphy-common.h
+++ b/drivers/marvell/comphy/phy-comphy-common.h
@@ -87,7 +87,7 @@
 
 #define COMPHY_SATA_MODE	0x1
 #define COMPHY_SGMII_MODE	0x2	/* SGMII 1G */
-#define COMPHY_HS_SGMII_MODE	0x3	/* SGMII 2.5G */
+#define COMPHY_2500BASEX_MODE	0x3	/* 2500Base-X */
 #define COMPHY_USB3H_MODE	0x4
 #define COMPHY_USB3D_MODE	0x5
 #define COMPHY_PCIE_MODE	0x6