tools/wrpc: add read only vuart (without stdin)

Signed-off-by: Adam Wujek <dev_public@wujek.eu>
3 jobs from wrpc-v5 in 3 minutes and 44 seconds
Status Job ID Name Coverage
  Compile
failed #14694
ohwrsw
make_all

02:45

passed #14695
ohwrsw
make_rt_cpu

00:23

passed #14693
ohwrsw
make_wrpc_sw

00:35