tests: drivers: spi loopback testcase yaml for stm32 dma

This commit adds two stm32 config to execute the testcase
when the SPI is using interrupt mode for transfer.
when the SPI is using DMA for transfer (not Interrupt nor ASYNC mode).
to run the on some specific (listed) stm32 boards on SPI instance.
Note the hw fixture (physical connection on the board)

Signed-off-by: Francois Ramu <francois.ramu@st.com>

tests/drivers/spi/spi_loopback/overlay-stm32-spi-dma.conf

@@ -0,0 +1,5 @@
+# enable DMA mode for SPI loopback test
+CONFIG_SPI_LOOPBACK_DRV_NAME="SPI_1"
+CONFIG_SPI_STM32_DMA=y
+CONFIG_SPI_STM32_INTERRUPT=n
+CONFIG_SPI_ASYNC=n

tests/drivers/spi/spi_loopback/overlay-stm32-spi.conf

@@ -0,0 +1,2 @@
+# enable stm32 spi instance for loopback test
+CONFIG_SPI_LOOPBACK_DRV_NAME="SPI_1"

tests/drivers/spi/spi_loopback/testcase.yaml

@@ -6,6 +6,7 @@ common:
 tests:
   drivers.spi.loopback:
     harness: ztest
+    filter: not CONFIG_SOC_FAMILY_STM32
     harness_config:
       fixture: spi_loopback
   driver.spi.loopback.internal:
@@ -17,3 +18,18 @@ tests:
     harness_config:
       fixture: spi_loopback
     platform_allow: frdm_k64f
+  drivers.stm32_spi.loopback:
+    harness: ztest
+    extra_args: OVERLAY_CONFIG="overlay-stm32-spi.conf"
+    harness_config:
+      fixture: spi_loopback
+    filter: CONFIG_SOC_FAMILY_STM32
+  drivers.stm32_spi_dma.loopback:
+    tags: dma
+    harness: ztest
+    harness_config:
+      fixture: spi_loopback
+    extra_args: OVERLAY_CONFIG="overlay-stm32-spi-dma.conf"
+    filter: CONFIG_SOC_FAMILY_STM32
+    platform_allow: nucleo_g474re nucleo_f207zg nucleo_f429zi nucleo_f746zg nucleo_wb55rg
+        nucleo_wl55jc nucleo_h743zi