Changes the implementation of the L86xxx driver to use the
gnss_lowerhalf driver implementation, simplifying this driver's logic.
It also fixes the `read_line` function which would early return on `\r`,
as well as adding some retries for response checking and better mutex
locking.
Signed-off-by: Matteo Golin <matteo.golin@gmail.com>
Matteo Golin
b0760dceb6