Bluetooth: samples: hci_uart: Remove unneeded config options

Remove data length and phy update set to 'n' on board that does not
support these features anyway. BT_CTLR_DATA_LEN_SUPPORTED and
BT_CTLR_PHY_UPDATE_SUPPORTED are both set to 'n'.

Signed-off-by: Joakim Andersson <joakim.andersson@nordicsemi.no>

Author: joerchan

samples/bluetooth/hci_uart/boards/bbc_microbit.conf

@@ -4,5 +4,3 @@ CONFIG_MAIN_STACK_SIZE=512
 CONFIG_IDLE_STACK_SIZE=256
 CONFIG_ISR_STACK_SIZE=512
 CONFIG_BT_MAX_CONN=10
-CONFIG_BT_PHY_UPDATE=n
-CONFIG_BT_DATA_LEN_UPDATE=n