Kernel: Fix run script to enable networking on Q35 machines

Also, we enable KVM to accelerate the execution when booting with
q35_cmd or qcmd options in the run script.

Kernel/run

@@ -19,7 +19,7 @@ cd "$script_path"
 $SERENITY_EXTRA_QEMU_ARGS
 -s -m $SERENITY_RAM_SIZE
 -cpu max
--d cpu_reset,guest_errors 
+-d cpu_reset,guest_errors
 -device VGA,vgamem_mb=64
 -hda _disk_image
 -device ich9-ahci
@@ -84,7 +84,9 @@ elif [ "$1" = "q35_cmd" ]; then
  # ./run: qemu with SerenityOS with custom commandline
  $SERENITY_QEMU_BIN \
  $SERENITY_COMMON_QEMU_Q35_ARGS \
- -device e1000 \
+ $SERENITY_KVM_ARG \
+ -netdev user,id=breh,hostfwd=tcp:127.0.0.1:8888-10.0.2.15:8888,hostfwd=tcp:127.0.0.1:8823-10.0.2.15:23 \
+ -device e1000,netdev=breh \
  -kernel kernel \
  -append "${SERENITY_KERNEL_CMDLINE}"
 elif [ "$1" = "qcmd" ]; then
@@ -98,7 +100,9 @@ elif [ "$1" = "qcmd" ]; then
  # ./run: qemu with SerenityOS with custom commandline
  $SERENITY_QEMU_BIN \
  $SERENITY_COMMON_QEMU_ARGS \
- -device e1000 \
+ $SERENITY_KVM_ARG \
+ -netdev user,id=breh,hostfwd=tcp:127.0.0.1:8888-10.0.2.15:8888,hostfwd=tcp:127.0.0.1:8823-10.0.2.15:23 \
+ -device e1000,netdev=breh \
  -kernel kernel \
  -append "${SERENITY_KERNEL_CMDLINE}"
 else