samples: Add bbc_microbit to hci_uart's whitelist

bbc_microbit has been observed to regress on this sample and is
therefore a good candidate for CI.

Signed-off-by: Sebastian Boe <[email protected]>

Author: SebastianBoe

samples/bluetooth/hci_uart/sample.yaml

@@ -4,7 +4,7 @@ sample:
 tests:
 -   test_arm:
         build_only: true
-        platform_whitelist: 96b_nitrogen nrf51_pca10028 nrf52_pca10040
+        platform_whitelist: 96b_nitrogen nrf51_pca10028 nrf52_pca10040 bbc_microbit
         tags: uart bluetooth
 -   test_nrf5:
         build_only: true