net: phy: DP83822: Update Kconfig with DP83825I support

Update the Kconfig description to indicate support for the DP83825I
device as well.

Fixes: 32b12dc8fde1  ("net: phy: Add DP83825I to the DP83822 driver")
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Dan Murphy <dmurphy@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>