samples: drivers: uart: move echo_bot into dedicated folder

The STM32 single_wire example was merged in parallel to this sample
and ended up as a sub-folder of this one. Separate both into their
own folders.

Signed-off-by: Martin Jäger <martin@libre.solar>

samples/drivers/uart/echo_bot/CMakeLists.txt

@@ -3,6 +3,6 @@
 cmake_minimum_required(VERSION 3.20.0)
 
 find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
-project(uart_sample)
+project(uart_echo_bot)
 
 target_sources(app PRIVATE src/main.c)

samples/drivers/uart/echo_bot/README.rst

@@ -24,7 +24,7 @@ Build and flash the sample as follows, changing ``nrf52840dk_nrf52840`` for
 your board:
 
 .. zephyr-app-commands::
-   :zephyr-app: samples/drivers/uart
+   :zephyr-app: samples/drivers/uart/echo_bot
    :board: nrf52840dk_nrf52840
    :goals: build flash
    :compact: