mgmt: mcumgr: smp_bt: Use UUID encode macro for 128-bit UUIDs
mgmt: mcumgr: smp_bt: Use UUID encode macro for 128-bit UUIDs

Use UUID encode macro fro 128-bit UUIDs for readability. This makes
it easier to see which service you are working with as the
bt_uuid_to_str prints the 128-bit UUIDs in this format.

Signed-off-by: Joakim Andersson <cf0fcab5d38d6e132e92a97bcb0bae257abf4936@nordicsemi.no>

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