Add nucleo_wl55jc to platform_allow for lora send/receive and class_a
samples. The board has a variation of the sx1262 driver, this should
allow to build test that code path.
Fix the existing config as well to specify the platforms on a single
line, as currently only the last entry is considered.
Signed-off-by: Fabio Baltieri <fabio.baltieri@gmail.com>