arm: multi_v7_defconfig: Add virtio drivers

To make multi_v7_defconfig really "multi", let's add virtio drivers
to allow booting a default kernel as a KVM/QEMU guest.
MACH_VIRT is already defined, so we just add VIRTIO_BLK, VIRTIO_NET
and VIRTIO_CONSOLE to actually make this kernel useful in a guest.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/configs/multi_v7_defconfig

@@ -186,6 +186,7 @@ CONFIG_MTD_UBI=y
 CONFIG_BLK_DEV_LOOP=y
 CONFIG_BLK_DEV_RAM=y
 CONFIG_BLK_DEV_RAM_SIZE=65536
+CONFIG_VIRTIO_BLK=y
 CONFIG_AD525X_DPOT=y
 CONFIG_AD525X_DPOT_I2C=y
 CONFIG_ATMEL_TCLIB=y
@@ -208,6 +209,7 @@ CONFIG_SATA_HIGHBANK=y
 CONFIG_SATA_MV=y
 CONFIG_SATA_RCAR=y
 CONFIG_NETDEVICES=y
+CONFIG_VIRTIO_NET=y
 CONFIG_HIX5HD2_GMAC=y
 CONFIG_SUN4I_EMAC=y
 CONFIG_MACB=y
@@ -304,6 +306,8 @@ CONFIG_SERIAL_CONEXANT_DIGICOLOR=y
 CONFIG_SERIAL_CONEXANT_DIGICOLOR_CONSOLE=y
 CONFIG_SERIAL_ST_ASC=y
 CONFIG_SERIAL_ST_ASC_CONSOLE=y
+CONFIG_HVC_DRIVER=y
+CONFIG_VIRTIO_CONSOLE=y
 CONFIG_I2C_CHARDEV=y
 CONFIG_I2C_DAVINCI=y
 CONFIG_I2C_MUX=y
@@ -808,3 +812,7 @@ CONFIG_CRYPTO_GHASH_ARM_CE=m
 CONFIG_CRYPTO_DEV_ATMEL_AES=m
 CONFIG_CRYPTO_DEV_ATMEL_TDES=m
 CONFIG_CRYPTO_DEV_ATMEL_SHA=m
+CONFIG_VIRTIO=y
+CONFIG_VIRTIO_PCI=y
+CONFIG_VIRTIO_PCI_LEGACY=y
+CONFIG_VIRTIO_MMIO=y