Remove usage of Kconfig symbol `CONFIG_BT_DEBUG_LOG` from samples. It
has been deprecated since this PR:
https://github.com/zephyrproject-rtos/zephyr/pull/56183
The Kconfig symbols has been replaced by `CONFIG_LOG=y` on most of the
cases. Or it has been removed when not needed anymore.
Signed-off-by: Théo Battrel <theo.battrel@nordicsemi.no>
Samples peripheral_gatt_write and central_gatt_write to
demonstration use of GATT Write Command.
Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>