Rename struct bt_csis_client_set to
struct bt_csis_client_csis_inst, as that is more descriptive
of the actual content of the struct.
This also avoids the confusion about what a "set" is,
which is clearly not a single instance of CSIS
on a single remote server.
Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
e9703294b1