arm: ls102xa: Fix RGMII phy-connection-type FDT fixup

In ft_fixup_enet_phy_connect_type(), use strlen() instead of sizeof()
on the pointer result of phy_string_for_interface(). sizeof() was
returning the size of the pointer (4 bytes), resulting in the
phy-connection-type being set to "rgmi" rather than "rgmii-id".

Signed-off-by: Brendan Shanks <brendan.shanks@teradek.com>
Cc: York Sun <york.sun@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>

arch/arm/cpu/armv7/ls102xa/fdt.c

@@ -64,8 +64,8 @@ void ft_fixup_enet_phy_connect_type(void *fdt)
 		do_fixup_by_path(fdt, enet_path, "phy-connection-type",
 				 phy_string_for_interface(
 				 PHY_INTERFACE_MODE_RGMII_ID),
-				 sizeof(phy_string_for_interface(
-				 PHY_INTERFACE_MODE_RGMII_ID)),
+				 strlen(phy_string_for_interface(
+				 PHY_INTERFACE_MODE_RGMII_ID)) + 1,
 				 1);
 	}
 }