tests: drivers: spi loopback remove conf for most of the stm32 boards

The testcase is including a generic configuration conf
for the stm32 target boards when running the SPI loopback in
interrupt and DMA mode. Thus, the board specific conf file is useless.

Signed-off-by: Francois Ramu <[email protected]>

Author: FRASTM

tests/drivers/spi/spi_loopback/boards/b_u585i_iot02a.conf

@@ -4,20 +4,15 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-&spi1 {
-	dmas = <&dmamux1 0 12 0x440
-		&dmamux1 7 11 0x480>;
+&spi2 {
+	pinctrl-0 = <&spi2_miso_pb14 &spi2_mosi_pb15>;
+	pinctrl-names = "default";
+	dmas = <&dma1 4 0 0x28440 0x03
+		&dma1 3 0 0x28480 0x03>;
 	dma-names = "tx", "rx";
-};
-
-&dma1 {
 	status = "okay";
 };
 
-&dma2 {
-	status = "okay";
-};
-
-&dmamux1 {
+&dma1 {
 	status = "okay";
 };

tests/drivers/spi/spi_loopback/boards/nucleo_f103rb.conf

@@ -1,10 +1 @@
-CONFIG_SPI_LOOPBACK_DRV_NAME="SPI_1"
-
-CONFIG_SPI_STM32_DMA=y
-CONFIG_SPI_STM32_INTERRUPT=n
-
-CONFIG_SPI_ASYNC=n
-
-CONFIG_SPI_LOOPBACK_MODE_LOOP=n
-
 CONFIG_NOCACHE_MEMORY=y