ci: testbed-01: add Nokia Valyrian labgrid bits for initramfs based boot

Nokia Valyrian board should be integrated into the testbeds, so lets add
labgrid support bits for initramfs based boot into testbed-01 for the
start.

References: PCF-2338
Signed-off-by: Petr Štetiar <petr.stetiar@prplfoundation.org>
Signed-off-by: Peter Steinhaeuser <ps@embedd.com>

.testbed/labgrid/default.yaml

@@ -1,5 +1,36 @@
 targets:
 
+  nokia-valyrian-initramfs:
+    resources:
+      RawSerialPort:
+        port: "/dev/nokia-valyrian"
+      ModbusTCPCoil:
+        host: quido.testbed-01.vpn.true.cz
+        coil: 3
+        managed_coils: 8
+        exclusive_coil_mode: True
+        write_multiple_coils: True
+    drivers:
+      ModbusCoilDriver: {}
+      DigitalOutputPowerDriver: {}
+      SerialDriver:
+        txdelay: 0.01
+      ShellDriver:
+        console_ready: Please press Enter to activate this console.
+        prompt: 'root@[\w()]+:[^ ]+ '
+        login_prompt: built-in shell (ash)
+        await_login_timeout: 15
+        username: kingbanik
+      UBootDriver:
+        prompt: 'AN7581> '
+        interrupt: '0'
+        init_commands:
+          - setenv ipaddr 192.168.1.1
+          - setenv serverip 192.168.1.2
+          - tftpboot 0x91800000 prplos-airoha-an7581-nokia_valyrian-initramfs-kernel.bin
+        boot_command: bootm
+      UBootStrategy: {}
+
   # needs patched u-boot for emmc r/w https://lists.denx.de/pipermail/u-boot/2021-February/441964.html
   turris-omnia-emmc:
     resources: