drivers: serial: serial_test: Move ring buf dep to Kconfig

This commit moves the dependency management between the
RING_BUFFER and UART_ASYNC_API or UART_INTERRUPT_DRIVEN
options to the Kconfig Kconfig.test.

If either UART API options listed are selected, the
RING_BUFFER option must be selected. This is now handled
automatically by Kconfig instead of causing a build
assert.

The asserts where added with this PR #59880, and are
removed in this commit.

Signed-off-by: Bjarki Arge Andreasen <baa@trackunit.com>

drivers/serial/Kconfig.test

@@ -8,3 +8,4 @@ config SERIAL_TEST
 	select SERIAL_HAS_DRIVER
 	select SERIAL_SUPPORT_INTERRUPT
 	select SERIAL_SUPPORT_ASYNC
+	select RING_BUFFER if (UART_INTERRUPT_DRIVEN || UART_ASYNC_API)

drivers/serial/serial_test.c

@@ -21,9 +21,6 @@
 
 LOG_MODULE_REGISTER(mock_serial, CONFIG_LOG_DEFAULT_LEVEL);
 
-BUILD_ASSERT(!IS_ENABLED(CONFIG_UART_INTERRUPT_DRIVEN) || IS_ENABLED(CONFIG_RING_BUFFER));
-BUILD_ASSERT(!IS_ENABLED(CONFIG_UART_ASYNC_API) || IS_ENABLED(CONFIG_RING_BUFFER));
-
 #define DT_DRV_COMPAT vnd_serial
 struct serial_vnd_data {
 #ifdef CONFIG_RING_BUFFER