Bluetooth: shell: fix compilation
Bluetooth: shell: fix compilation

phy2str also used when CONFIG_BT_USER_PHY_UPDATE not only
when CONFIG_BT_OBSERVER

Signed-off-by: Ilya Averyanov <bc2eee689b5dd322453797a08565bc0e660e1f07@gmail.com>

zephyrproject-rtos/zephyr,finikorg/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,galak/zephyr,nashif/zephyr,galak/zephyr,nashif/zephyr,Vudentz/zephyr,nashif/zephyr,finikorg/zephyr,Vudentz/zephyr,nashif/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,finikorg/zephyr,Vudentz/zephyr,finikorg/zephyr,galak/zephyr,galak/zephyr