arm64: defconfig: enable NAND on Armada 7K/8K SoCs

The PXA3xx NAND driver supports also the NAND controller found on the
Armada 7K/8K SoCs, so enable it.
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

arch/arm64/configs/defconfig

@@ -156,6 +156,7 @@ CONFIG_MTD_BLOCK=y
 CONFIG_MTD_M25P80=y
 CONFIG_MTD_NAND=y
 CONFIG_MTD_NAND_DENALI_DT=y
+CONFIG_MTD_NAND_PXA3xx=y
 CONFIG_MTD_SPI_NOR=y
 CONFIG_BLK_DEV_LOOP=y
 CONFIG_BLK_DEV_NBD=m