microblaze: defconfig: Enable the Marvell phy driver

Enable the marvell phy driver by default as it is commonly
used PHY on multiple microblaze based evaluation boards.
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/3912fb168671dd5b418da8947ea1c463b554fa86.1698155190.git.michal.simek@amd.com

arch/microblaze/configs/mmu_defconfig

@@ -44,6 +44,7 @@ CONFIG_NETDEVICES=y
 CONFIG_XILINX_EMACLITE=y
 CONFIG_XILINX_AXI_EMAC=y
 CONFIG_XILINX_LL_TEMAC=y
+CONFIG_MARVELL_PHY=y
 # CONFIG_INPUT is not set
 # CONFIG_SERIO is not set
 # CONFIG_VT is not set