With newlib_libc enabled, a warning was printed for this memcpy.
uuid is a `bt_uuid_128`, while BT_UUID_GATT_CCC is only `bt_uuid_16`.
Fixes#808.
Full warning:
[53/272] Building C object CMakeFiles/app.dir/src/split/bluetooth/central.c.obj
In file included from /home/okke/.local/zephyr-sdk-0.11.2/arm-zephyr-eabi/arm-zephyr-eabi/sys-include/string.h:180,
from /home/okke/dev/zmk/zephyr/include/bluetooth/bluetooth.h:21,
from ../../src/split/bluetooth/central.c:9:
../../src/split/bluetooth/central.c: In function 'split_central_discovery_func':
../../src/split/bluetooth/central.c:130:9: warning: '__builtin_memcpy' forming offset [5, 17] is out of the bounds [0, 4] of object '({anonymous})' with type 'struct bt_uuid_16[1]' [-Warray-bounds]
130 | memcpy(&uuid, BT_UUID_GATT_CCC, sizeof(uuid));
| ^~~~~~
/home/okke/dev/zmk/zephyr/include/bluetooth/uuid.h:72:45: note: '({anonymous})' declared here
72 | ((struct bt_uuid *) ((struct bt_uuid_16[]) {BT_UUID_INIT_16(value)}))
| ^
/home/okke/dev/zmk/zephyr/include/bluetooth/uuid.h:372:2: note: in expansion of macro 'BT_UUID_DECLARE_16'
372 | BT_UUID_DECLARE_16(BT_UUID_GATT_CCC_VAL)
| ^~~~~~~~~~~~~~~~~~
../../src/split/bluetooth/central.c:130:23: note: in expansion of macro 'BT_UUID_GATT_CCC'
130 | memcpy(&uuid, BT_UUID_GATT_CCC, sizeof(uuid));
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