radio_pkt_big_ctrl_get() returns a statically allocated
buffer of type pdu_big_ctrl, but the callers expect a
buffer where a whole PDU for a BIG control packet can fit
(not just space for the payload),
and use it as such, overflowing this statically
allocated buffer, and smashing other variables after.
Let's fix it by allocating a buffer of the correct size
to fit a BIG control PDU.
Fixes https://github.com/zephyrproject-rtos/zephyr/issues/64497
Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>
08f6532b67