In the 'vsc73xx_phy_write' function, the register value is missing,
and the phy write operation always sends zeros.
This commit passes the value variable into the proper register.
Fixes: 975ae7c69d51 ("net: phy: vitesse: Add support for VSC73xx")
Signed-off-by: Pawel Dembicki <paweldembicki@xxxxxxxxx>