samples: hci_uart: Remove NRF5 Kconfig baud rate setting

The UART_NRF5_BAUD_RATE Kconfig symbol was removed in commit
748f724 ("serial: dts: remove !HAS_DTS related Kconfig"). Looks
like this has been moved to DTS.

Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>

samples/bluetooth/hci_uart/nrf5.conf

@@ -4,7 +4,6 @@ CONFIG_UART_CONSOLE=n
 CONFIG_GPIO=y
 CONFIG_SERIAL=y
 CONFIG_UART_INTERRUPT_DRIVEN=y
-CONFIG_UART_NRF5_BAUD_RATE=1000000
 CONFIG_UART_NRF5_FLOW_CONTROL=y
 CONFIG_MAIN_STACK_SIZE=512
 CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=512