tests: drivers: dma: adapt test applications on stm32l476 nucleo board

The dma test applications for MEM-to-MEM transfers are modified
to run on the stm32l476 with a DMA.
The CONFIG_DMA_LOOP_TRANSFER_DRV_NAME is either DMA_1 or DMA_2
CONFIG_DMA_LOOP_TRANSFER_CHANNEL_NR from 1 to 7 for DMA_1
CONFIG_DMA_LOOP_TRANSFER_CHANNEL_NR from 1 to 5 for DMA_2

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

Author: FRASTM

tests/drivers/dma/chan_blen_transfer/boards/nucleo_l476rg.conf

@@ -0,0 +1,3 @@
+CONFIG_DMA_TRANSFER_DRV_NAME="DMA_1"
+CONFIG_DMA_TRANSFER_CHANNEL_NR_0=4
+CONFIG_DMA_TRANSFER_CHANNEL_NR_1=2

tests/drivers/dma/chan_blen_transfer/boards/nucleo_l476rg.overlay

@@ -0,0 +1,13 @@
+/*
+ * Copyright (c) 2020 STMicroelectronics
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&dma1 {
+	status = "okay";
+};
+
+&dma2 {
+	status = "okay";
+};

tests/drivers/dma/loop_transfer/boards/nucleo_l476rg.conf

@@ -0,0 +1,2 @@
+CONFIG_DMA_LOOP_TRANSFER_DRV_NAME="DMA_1"
+CONFIG_DMA_LOOP_TRANSFER_CHANNEL_NR=4

tests/drivers/dma/loop_transfer/boards/nucleo_l476rg.overlay

@@ -0,0 +1,13 @@
+/*
+ * Copyright (c) 2020 STMicroelectronics
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&dma1 {
+	status = "okay";
+};
+
+&dma2 {
+	status = "okay";
+};