riscv: qemu: Include some useful commands

With the virtio net and blk drivers, we can do more stuff with some
useful commands. Imply those in the board Kconfig.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

board/emulation/qemu-riscv/Kconfig

@@ -21,5 +21,13 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	imply VIRTIO_MMIO
 	imply VIRTIO_NET
 	imply VIRTIO_BLK
+	imply CMD_PING
+	imply CMD_FS_GENERIC
+	imply DOS_PARTITION
+	imply EFI_PARTITION
+	imply ISO_PARTITION
+	imply CMD_EXT2
+	imply CMD_EXT4
+	imply CMD_FAT
 
 endif