powerpc/configs/dpaa: enable the Cortina PHY driver

Cortina PHYs are present on T4240RDB and T2080RDB. Enable the driver
by default.
Signed-off-by: NCamelia Groza <camelia.groza@nxp.com>
Signed-off-by: NScott Wood <oss@buserror.net>

arch/powerpc/configs/dpaa.config

@@ -2,3 +2,4 @@ CONFIG_FSL_DPAA=y
 CONFIG_FSL_PAMU=y
 CONFIG_FSL_FMAN=y
 CONFIG_FSL_DPAA_ETH=y
+CONFIG_CORTINA_PHY=y