net: phy: marvell: use phy_write_paged() to set MSCR

Use phy_write_paged() in m88e1118_config_init() to set the MSCR value.
We leave the other paged write for the LEDs in case the DT register
parsing is relying on this page.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>