update(plat/qemu): cmd requires net=IP_ADDR/RANGE for SSH to run properly

Without this SSH connection will hang, until is reset by peer (timeout).

This matches the makefile command present in the the makefile on the same directory.

Signed-off-by: ElectroQuanta <id6892@alunos.uminho.pt>
Signed-off-by: Jose Martins <josemartins90@gmail.com>

platforms/qemu-aarch64-virt/README.md

@@ -81,7 +81,8 @@ qemu-system-aarch64 -nographic\
    -cpu cortex-a53 -smp 4 -m 4G\
    -bios $BAO_DEMOS_WRKDIR/imgs/$PLATFORM/flash.bin \
    -device loader,file="$BAO_DEMOS_WRKDIR_IMGS/bao.bin",addr=0x50000000,force-raw=on\
-   -device virtio-net-device,netdev=net0 -netdev user,id=net0,hostfwd=tcp:127.0.0.1:5555-:22\
+   -device virtio-net-device,netdev=net0\
+   -netdev user,id=net0,net=192.168.42.0/24,hostfwd=tcp:127.0.0.1:5555-:22\
    -device virtio-serial-device -chardev pty,id=serial3 -device virtconsole,chardev=serial3
 ```
 

platforms/qemu-riscv64-virt/README.md

@@ -42,7 +42,8 @@ cp $BAO_DEMOS_OPENSBI/build/platform/generic/firmware/fw_payload.elf\
  qemu-system-riscv64 -nographic\
     -M virt -cpu rv64 -m 4G -smp 4\
     -bios $BAO_DEMOS_WRKDIR_IMGS/opensbi.elf\
-    -device virtio-net-device,netdev=net0 -netdev user,id=net0,hostfwd=tcp:127.0.0.1:5555-:22\
+    -device virtio-net-device,netdev=net0 \
+    -netdev user,id=net0,net=192.168.42.0/24,hostfwd=tcp:127.0.0.1:5555-:22\
     -device virtio-serial-device -chardev pty,id=serial3 -device virtconsole,chardev=serial3 -S
 ```