Merge branch 'feature/ot_enable_rcp_uart_for_br_by_default' into 'master'

feat(Thread): enable RCP uart configuration for BR by default

See merge request espressif/esp-idf!28897

examples/openthread/ot_br/sdkconfig.defaults

@@ -24,6 +24,7 @@ CONFIG_MBEDTLS_ECJPAKE_C=y
 #
 CONFIG_OPENTHREAD_ENABLED=y
 CONFIG_OPENTHREAD_BORDER_ROUTER=y
+CONFIG_OPENTHREAD_RADIO_SPINEL_UART=y
 # end of OpenThread
 
 #